tonight at ten — donald trump insists he has no choice but to use emergency powers, to fund a border wall with mexico. defying criticism — including from his own party — he says the us faces an "invasion" of migrants, drugs, and human traffickers. in areas where we don't have a barrier, then very hard to make america great again. but democrats say the president's claims are bogus, and they'll see him in court. also tonight... should she be allowed to return to the uk? shamima begum's family says yes. mi6 warns ex—members of the islamic state group still pose a threat. chanting: this is what democracy looks like! making their voices heard — schoolchildren across the country protest over climate change. most knee and hip replacements now last much longer than previously thought — researchers say up to 25 years. and a celebrated chronicler of the black british experience, the author andrea levy has died —

she was 62. for my generation of black people in this country, there's always an andrea levy book on our book shelves. and coming up on sportsday on bbc news — can watford hold on at queens park rangers to qualify for their first fa cup quarter—final in three years? good evening. donald trump has defied his critics, and many in his own party, by declaring a national emergency to bypass congress, to get the billions of dollars he says he needs to build a border wall with mexico. it means he can redirect funds from other government departments. at a news conference

at the white house, he said a barrier was needed to stop an "invasion" of drugs, gangs, human traffickers and undocumented migrants. however, democrats say the move is unconstitutional because the president has exaggerated problems on the border, to try to fulfil a rash campaign promise, and they'll fight him all the way to the supreme court. our north america editor jon sopel reports. ladies and gentlemen, the president of the united states. donald trump had an unpalatable choice. having not got a deal with congress, he was either going to have to admit failure on funding his wall with mexico — his signature campaign pledge — or he was going to have to go nuclear. he chose nuclear. this was now a national emergency on the southern border. we're going to be signing today, and registering, national emergency, and it's a great thing to do, because we have an invasion of drugs, invasion of gangs, invasion of people,

and it's unacceptable. watched by relatives who've had family members killed by illegal immigrants, the president rode roughshod over the powers of lawmakers to set budgets and to set up a confrontation with congress that he fully recognises is likely to end up in the courts. we will have a national emergency and we will then be sued, and they will sue us in the united circuit, even though it shouldn't be there, and we will possibly get a bad ruling and then we'll get another bad ruling, and then we'll end up in the supreme court. and all the time the courts are deliberating, it means there will be no substantial building work taking place — less building a wall than hitting one. but here's the problem. there's a lot of fencing and structures, but there are places where itjust ends, so people — like this mother and child from guatemala — can just walk round it. "my little girl is hungry," she says, "and i don't have any money." in recent years the number of illegal immigrants trying

to enter the us has been in decline and most of the drugs that enter the country from mexico come from legal crossing points like this one. but a lot of border patrol officers who back the president's call for a wall make this point about the problem subsiding. i wouldn't say it's nothing like it was, i would say that it's changed but that is the equivalent of saying that if your house is only getting robbed one day out of a week now instead of all seven that you're done. we're not done. back in washington the democrats are considering their next move. it's hard to believe they won't challenge this. president trump couldn't convince mexico, he couldn't convince the american people, he couldn't convince their elected representatives to pay for his ineffective and expensive wall. make no mistake, congress will defend our constitutional authorities in every way that we can. donald trump's signature is now on this declaration. there are many on both sides

of the divide who question how much of a national emergency this really is. and it won't be lost on them that on day one of the emergency the president flew off to his golf course in florida — not the border with mexico. jon sopel, bbc news, washington. america is surely heading for a constitutional crisis over all this so constitutional crisis over all this so it's probably likely the supreme court that will have the final word? i think there's a very high probability of that and the number of times i stood here and said democrats and republicans are bitterly divided, actually this is much more a division between the power of the executive, that is the man who lives in there, and congress, who feel that donald trump has usurped some of their powers. i've been looking back over the last 30 or a0 years that this emergency powers act has been in place and there's never been an emergency declaration like today. they've been over issues that people broadly

agree about, most are still in place, but donald trump felt he had to use a national emergency provision if he was going to get his wall built. the alternative for him was not getting the wall built, in which case you will have let down an awful lot of his core supporters and he thought this was a price worth paying. so ultimately, if as you surmise, this ends up in the supreme court ina surmise, this ends up in the supreme court in a matter of months or maybe even longer, then those justices will have to decide whether this is a true national emergency, or whether it is a political emergency for donald trump. 0k, jon sopel, thank you, at the white house. the family of shamima begum — the teenager whojoined the islamic state group in syria — have said she should be allowed to return. ina in a statement tonight they said they'd lost hope of ever seeing her again and as a british citizen she has every expectation to be returned to the uk. but the home secretary sajid javid has suggested he may prevent those who joined is from

ever coming home on national security grounds. our home affairs correspondent daniel sandford has the latest. inside the al—hawl camp in northern syria, and the women and children who fled from the fighting in one of the last strongholds of the islamic state group. this is where the former bethnal green schoolgirl shamima begum is. herfamily had green schoolgirl shamima begum is. her family had lost green schoolgirl shamima begum is. herfamily had lost hope green schoolgirl shamima begum is. her family had lost hope of seeing her again her family had lost hope of seeing heragain and her family had lost hope of seeing her again and tonight, in a statement, they asked the british government to help return her and her unborn baby. as a british citizen, they said... they said they would welcome the police investigating her, something thatis police investigating her, something that is inevitable if she returns. we have to be clear that people who leave this country to support that regime are people who,

if they do return, have to answer for their actions. some 850 people left the uk to join is and around half have already come back. today, alex younger, the head of the secret intelligence service mi6 warned that at least some returnees will pose a risk. the home secretary said this morning he would prevent people involved in terrorist organisations returning to britain. so what does that mean for shamima begum, who left the uk asa as a schoolgirl, could she have had citizenship taken away? if she doesn't have another nationality, as i believe to be the case, then it is morally unacceptable to refuse her entry, as well as legally unacceptable, because otherwise she would be stateless, and no person in the world can be stateless under the law. herfamily said

her family said they were shocked to hear her say she didn't regret going to is. they explain it by suggesting she was groomed at the age of 15 and might have been wary of what she was saying in a camp surrounded by is sympathisers. and rashad ali, who is an expert in de—radicalisation, says is supporters can be turned round. we know, in the uk, we have worked over the last ten years with fairly hard—line extremists who have renounced their ideology, have remorse for their actions, and have taken part actually in helping others move away from extremist tendencies and violent ideologies. the kurdish red crescent says there were over 1000 new arrivals at al—hawl just this morning. decisions will have to be made soon about what to do with the british is supporters among them. daniel sandford, bbc news. schoolchildren across the uk have been taking part in a a day of protests,

calling for action on climate change. organisers say pupils walked out of schools in more than 60 towns and cities, to highlight what they see as a lack of action by the government. manchester is one of the places where children took to the streets, from where frankie mccamley reports. we're angry that the government's not doing anything, but we also see it as important to fight for our futures. to all the politicians, listen to what we have to say. you failed at saving your own future, so now can you try and save ours? there's no time to rest. we have to do something to save the planet. chanting: this is what democracy looks like! different voices, one clear message. today was a day led by the children, for the children and their future. thousands campaigned in dozens of protests across the country. they say, "you don't have a voice"! a call for action in sheffield... what do we want? climate action! chanting in ullapool. .. marching in brighton...

a real sense of urgency in cardiff, and, in manchester, there was music. # born to love in everyone... before nine—year—old lilia had her say. i'm worried about climate change because of animals. would you like it if your home was disappearing in front of your eyes? this is clearly the first time many of these pupils have ever walked out of school and just by looking at the age of some of these, the first time they've ever been on a protest, but their message here is clear. they want to protect the future of the planet and safeguard their future. the action is part of a much wider global movement, inspired by 16—year—old greta thunberg from sweden. she's been striking from school every friday, calling on her government to lower its carbon footprint. you are not mature enough to tell it like it is. even that burden, you leave to us children. her persistence later sparked protests across the world,

from australia to belgium and ireland earlier this week. the government has said today's protests are a waste of lesson time and increasing teachers‘ workload, but the threat of school disciplinary action pales in significance to the danger these youngsters think the planet is under from climate change. frankie mccamley, bbc news, in manchester. a man has been charged with the murder of three elderly men in exeter. 27—year—old alexander lewis—ra nwell, from north devon, will appear in court tomorrow. he is charged with murdering 80—year—old anthony payne, who was found dead at his house on monday, and 8a—year—old twins dick and roger carter, who were found dead just over a mile away the following day. police in bulgaria have launched an inquiry into the trade in illegal fighting dogs, after a bbc investigation. they re looking for ivaylo nikolov, who offered to sell a dog ready to take part in organised fights.

mr nikolov denied he was involved when confronted by the bbc. a new study suggests the majority of knee and hip replacements last much longer than previously thought. researchers at the university of bristol say replacementjoints can remain effective for up to 25 years. it's hoped the findings will help doctors and patients decide when to carry out surgery. our health correspondent, jenny walrond, has more. 80—year—old wendy, 17 years on from a hip replacement, cycles more often than she drives. i was in intense pain, so it restricted everything i wanted to do. even cycling was getting quite difficult. and then i had the operation and i woke up and it was like a new person. it was magic. hip and knee replacements are two of the most common types of surgery. until now, doctors haven't been able

to give patients accurate information about how long they will continue to work. but a study published in the lancet journal shows that manyjoint replacements last for 25 years. for knees, it's over 80%, and almost 60% of hip replacements, much longer than previously thought. having surgery a second time on a replacement is more expensive and less likely to be successful, so knowing that the joints will last longer could help both patients and surgeons to make more informed decisions. the main implication is that patients can go into their surgery, or when deciding whether to have surgery, with their eyes open. they understand exactly what the risks are and exactly how long this hip replacement or knee replacement is likely to last. the nhs in england and wales carries out almost 200,000 hip and knee replacements each year. knowing how long they will last allows the health service to plan its resources at a time

when our ageing population means more people will need them. today's research can reassure patients like wendy that they too can stay active for longer. she is hoping her hip will last at least another ten years. one of my grandsons wants me to take him to barbados when i'm 90. so i've got to live until i'm 90 and take him to barbados like he wants me to do. hopefully, it will be good. jenny walrond, bbc news, bristol. a company which monitors thousands of offenders under the government's partial privatisation of the probation service has gone into administration. the firm, working links, was criticised by inspectors, who say it's "buckling" under the strain of commercial pressures. it's the first community rehabilitation company to become insolvent since the government outsourced the management of offenders. the natwest bank has lent £2 billion

to companies who want to stockpile in the event of britain leaving the eu without a deal. the indian government says pakistan will pay "a heavy price" after a suicide bomb attack in kashmir, which killed more than a0 indian security officials. a separatist militant group, jaish—e—mohammed, has claimed responsibility, and pakistan denies any involvement. kashmir has been a flash point between the two nuclear—armed states for decades, leading to three previous wars. the area is divided between them, but each claim all the territory as their own. the latest atrocity, the deadliest for almost 30 years, has led to fears of another serious confrontation. from new delhi, our correspondent sangita myska reports. these are the anguished families,

grieving for the fathers, sons and brothers killed in indian administered kashmir‘s worst terrorist atrocity in recent memory. their coffin is carried by fellow soldiers from the paramilitary force which yesterday became the target of islamist extremists. the men's deaths have led to a new escalation between the sub continent made two great nuclear powers, india and pakistan. the aftermath of the attack was caught on camera. this is all that was left of the bus, part ofa all that was left of the bus, part of a huge military convoy of indian forces. this is said to be the suicide bomber, one of a new generation of kashmiris radicalised ina region generation of kashmiris radicalised in a region where the majority of the population is muslim. the islamist militant group jaish—e—mohammed has claimed responsibility. based in pakistan, it has been fighting for kashmir‘s

independence for nearly 20 years. india says it has incontrovertible evidence that pakistan was directly involved. translation: iwant evidence that pakistan was directly involved. translation: i want to tell the terrorist outfits and their patrons that they have committed a huge mistake, and they will have to pay a big price for this. pakistan strongly denies the allegation and has accused india of carrying out human rights violations in the past. the two countries have fought three wa i’s the two countries have fought three wars over who should control kashmir. india has hundreds of thousands of troops stationed here, but security is getting worse. after the last major attack on indian forces two years ago, it launched military strikes inside pakistan. this attack has enraged many indians, who are convinced that pakistan is trying to destabilise the country. protests like this have erupted in several parts of the country, and are helping build

pressure on no wonder modi's government to take what is decisive action. if they have attacked, directly or through terrorists, we need to show our strength and retaliate. whatever they are doing is not acceptable to civilised society. tonight, india's prime minister laid a wreath for the victims. the question is, what his next step will be. sangita myska, bbc news, delhi. next week, mps looking into disinformation and fake news are expected to publish their final report into the way our personal data has been sometimes manipulated for political influence at the highest levels of power. and it's happening right around the world. here's our media editor, amol rajan. when you report fake news, which cnn does a lot, you are the enemy of the people. in just a few years, the phrase "fake news" has entered mainstream culture. then they've got the nerve to say we're fake news. you and your colleagues have fallen into this trap of fake news.

it's a calculated and corrosive term, often deployed by those trying to discreditjournalism, but the term "fake news" captures an urgent issue confronting modern democracies — disinformation in the digital age. in america, authorities are investigating social media's role in russian interference in the presidential election of 2016. the nearest thing in britain is the house of commons select committee enquiry into disinformation and fake news. over the past year, it has taken evidence from regulators, tech companies and those at the centre of allegations around the targeting of voters during the brexit referendum. the enquiry is looking at four areas in particular — first, whether social media firms are neither platforms nor publishers, but a new kind of company which has legal liability for harmful or illegal content. then there's the issue of electoral law. the committee wants new rules for digital campaigns, not least around the issue of shell corporations being used to hide identities.

next, what was the precise role of cambridge analytica? the committee has looked at the impact of the british data firm and has said its ceo misled them. finally, there's the kremlin question — to what extent, if any, did russia weaponise information during the brexit referendum, and why is there such a gulf between the government's warnings about security and the response of tech companies? facebook is taking disinformation more seriously and has appointed the charity full fact as its first independent fact—checkers in britain. one thing i'm aware of is, it might not be facebook in ten years' time, or it might notjust be facebook. we're going to need to write rules through open, democratic, transparent processes that apply to all these companies. last year, facebook was fined the maximum half a million pounds by the information commissioner for serious breaches in data protection law. have you seen satisfactory evidence that they've learned and changed? i am hopeful that we'll see more of that change.

that suggests we haven't so far. i haven't so far. i think it's yet to be seen. what do they need to do to comply with this regulatory regime which they're currently not doing? it's not good enough to say, "here's what we're doing". we need a proof point and we need... facebook can't mark their own homework. social media platforms like to think they're a benefit to democracy. across the west, that's in dispute. amol rajan, bbc news. the body of the footballer emiliano sala has arrived back in argentina for a funeral service in his home town tomorrow. police cars escorted the van carrying the 28—year—old's body. he died last month when a private plane he was on board crashed in the english channel, just two days after he'd completed a £15 million move to cardiff city. there have been numerous tributes to the award—winning author andrea levy, who's died at the age of 62.

she'd been receiving treatment for cancer. she made her name with the novel small island, about the windrush migrants who in the late i9a0s moved to britain from jamaica. she was widely regarded as the first black british author to achieve both critical and commercial success. lizo mzimba looks back at her life. the empire windrush brings to britain 500 jamaicans... in i9a8, andrea levy's father arrived on the empire windrush, the inspiration for her novel charting the hopes and struggles of a generation, small island, which won multiple awards and was adapted for tv and the stage. when it came out, i said to the publicist, "just give me a basket, i'll take them door—to—door". i really thought nobody would be interested. you think your white skin makes you better than me, don't you? we both finished fighting a war for a better world. we were on the same side. if anybody wants to have a look at how the windrush generation arrived here, and how we,

the sons and daughters of that generation, survived and are surviving, they have to refer to andrea's work. that's why, for my generation of black people in this country, there's always a andrea levy book on our bookshelves. andrea levy had grown up in london, and in her thirties had begun to write. her work was driven by her own curiosity about where she'd come from. it was a story which eventually took her back to britain's role in the caribbean slave trade. for every one slave who went to america, 12 went to the caribbean. it was massive. i have seen books on british history that don't mention slavery, you know, and you just sort of... it beggars belief. the character she created

was a house slave who bore a child to an estate master, and later, she discovered that that was the story of her own great, great grandmother. andrea levy, an author whose life and work was rooted in the story across generations of two small islands, britain and jamaica. andrea levy, who has died at age 62. and if you want to see more about andrea levy's life, the full imagine programme will be shown on monday at 10:a5pm, on bbc one. now time for the news where you are. have a very good night. hello and welcome to sportsday

capoue and through — watford become the first team to qualify for the quarter finals of this year's fa cup. gloucester upset premiership leaders exeter in a thrilling contest at kingsholm. and fighting her corner — caster semenya receives backing from the south african governemnt in her battle with the iaaf. here's the full list of fixtures, chelsea up

against manchester united at stamford bridge, live on bbc! on monday night. taken of the opposition but this is a different proposition. we are playing against the premier league champions, and the best manager in the world right now, he is a class act. he is someone that everyone wants to learn from. they have scored nine, six against chelsea, have you changed your game plan based on that? we have to play to the best of our abilities and hope that some of them have an off day. bit of cliche calling it a leveler

but do you think you'll have any pa rt but do you think you'll have any part to play and how will pan out on saturday ? we played very good recently, so i'm sure manchester city won't struggle too much, their place in the quarterfinals is already secured. in the end friday night under the lights, the first site of the cup and the fifth round, and over 20 years. but first, a moment to remember one of the heroes of 66. if you don't take those kind of

opportunities and chances are your opponent will. even if it was a slight of luck. they picked up the pace in the second half but they still could not find the equaliser. and it looks like they would be punished for it when andre found the net. in operation tonight, it would surely have allowed the school to stand. there was still time for the best chance of the evening, but it was one that they did not take. so it's watford into the next round and qpr go sliding out. inside the first ten minutes. ran

into the corner and put them in the lead, they then drew level in a couple of occasions before been before ben morgan found the try line with five minutes to go to take the victory, eslewhere bristol lost at home to wasps... there were three games in the proia this evening — edinburgh capped off a strong second—half performance with three tries to secure a huge bonus—point win over dragons, while an unconverted try from stuart mccloskey and a long—range penalty from john cooney was enough for an ulster victrory over ospreys. some other headlines tonight. leigh halfpenny is set to miss wales's match with england in the six nations next weekend, after suffereing a concussion setback. he's been out since november