a very warm welcome to bbc news, broadcasting to our viewers in north america and around the globe. my name's mike embley. our top stories: the diplomatic rift over the border wall — president trump suggests taxing imports from mexico. president pena nieto cancels a trip to washington. unless mexico is going to treat the united states fairly, with respect, such a meeting would be fruitless. britain's prime minister will meet mr trump on friday to talk trade. celebrations in the gambia for the first peaceful transfer of power in the country's modern history. and it may not seem much but this rough diamond is the largest uncut stone everfound in north america. we can give you a special close—up look. hello.

if mexicans hoped donald trump's promises on the campaign trail had just been bluster and bravado, it looks as though they, and many americans who voted against him, are in for more disappointment. mr trump has already ordered a start on the border wall. now the white house is threatening a new tax on imports. mexico's president has cancelled a visit to washington next week, a meeting mr trump said would be fruitless. if the two countries are heading for a possible trade war how much money is involved? official figures for 2015 show that the united states exported nearly $270 billion of goods and services to mexico. in return — mexico exported more than $316 billion of goods and services in the same year. that meant the us had a trade deficit of nearly $50 billion the white house says that figure was $60 billion for 2016. nick bryant has more. donald trump's new executive toy. his first ride today on air force one, that potent symbol of us presidential power.

but it was the cancelled travel plans of the mexican president that were at the centre of a diplomatic storm. his plane will stay grounded after a summit between the two leaders scheduled for washington next week was abruptly called off. this mexican stand—off is over the great totem of the trump presidency, the wall he's determined, notjust to build along the border, but also to get mexico to pay for. but in an angry speech last night, the country's president, enrique pena nieto, said he wouldn't foot the bill. so, shortly before leaving the oval office this morning, donald trump decided to conduct his diplomacy by tweet. by the time he spoke in philadelphia, the mexicans had announced the summit was off, and that earned a public scolding from president trump. the president of mexico and myself have agreed to cancel our planned

meeting scheduled for next week. unless mexico is going to treat the united states fairly, with respect, such a meeting would be fruitless, and i want to go a different route. almost a week into his term in office, it's already becoming clear that donald trump is changing the presidency more than the presidency is changing him. 0n prime—time tv last night, the former property tycoon gave a tour of the country's most prized piece of real estate and it was vintage donald trump. i don't want to change too much. i can be the most presidential person ever, other than possibly the great abe lincoln, all right? but i can be the most presidential person. he's still obsessed with the crowd size at his inauguration. a sea of love. but in a new interview with fox news, he turned his attention to the group calling itself "islamic state,"

saying its fighters were sick and demented. the people that we're going against, they don't wear uniforms, they're sneaky, dirty rats. and they blow people up in a shopping centre. and they blow people up in a church. these are bad people. the presidency is travelling at a hurtling pace. the late—breaking news that he's now calling for a 20% tax on mexican imports to pay for the wall. donald trump is clearly revelling in his seat of power, whether it's in the oval office or at 30,000 feet. beautiful. great plane. nick bryant, bbc news, washington. britain's prime minister theresa may has arrived in america at the start of a trip which she hopes will pave the way for a post—brexit trade deal with the united states. she'll be the first foreign leader to hold talks with donald trump at the white house on friday. 0ur political editor laura kuenssberg is travelling with mrs may. 0pposites attract. theresa may's hope. but how close does she want to get to him? the prime minister made a quieter

arrival, making her way down the windy steps in philadelphia. her convoy speeding towards her debut in trump land, here to make friends. no hate, no fear. a reminder right outside the 5—star hotel where they were both to speak, donald trump has many enemies as well. the prime minister's warm up act was the president himself. is he ready for her? i'm meeting with the prime minister tomorrow, as you know. great britain. i'm meeting with her tomorrow. i don't have my secretary, they want to talk trade, so i'll have to handle it myself. laughter which is ok. then it was her turn, with, as you would expect, fulsome reference to the friendship across the atlantic. it has been america's destiny to bear the leadership of the free world and to carry that heavy

responsibility on its shoulders, but my country, the united kingdom of great britain and northern ireland, has been proud to share that burden and to walk alongside you at every stage. applause cheering but this is much more than a meet and greet. theresa may came with a serious message for republicans and the world. under her leadership, no more western conflicts like iraq, or afghanistan, she suggested. this cannot mean a return to the failed policies of the past. the days of britain and america intervening in sovereign countries in an attempt to remake the world in our own image are over, but nor can we afford to stand idly by, when the threat is real and when it is in our own interests to intervene. we must be strong, smart and hard—headed, and we must demonstrate the resolve necessary

to stand up for our interests. and a warning perhaps directed at the president over an assertive russia. when it comes to russia, as so often it is wise to turn to the example of president reagan, who, during his negotiations with his opposite number mikhail gorbachev, used to abide by the adage — trust, but verify. with... applause with president putin, my advice is to engage, but beware. noticeable as well, her praise for the republicans and president trump's controversial win. because of what you have done together, because of that great victory you have won, america can be stronger, greater and more confident in the years ahead. even before she touched down though, theresa may had a taste of how much

political trouble closeness to president trump could cause. number ten believes the risk is worth it, because there's a big opportunity as well, but this new friendship could cause fireworks every time donald trump's speaks his mind. like suggesting torture, banned under british and international law, works. i want to do everything within the bounds of what you're allowed to do legally, but do i feel it works? absolutely i feel it works. the prime minister was adamant britain won't change its laws and signalled we might stop sharing intelligence with america if torture was brought back. here among the republican top brass, the idea is unlikely to fly. the deep—seated policy in american culture is not to torture. so theresa may is right and president trump is wrong? i didn't say that. just one of many awkward subjects the pm and president could discuss tomorrow, a test, even in politics true friends tell the truth to one another, not merely platitudes,

or what they want to hear. president trump's chief strategist, steve bannon, has described the mainstream media as the opposition party and said it should keep its mouth shut and listen for a while. in an interview with the new york times, mr bannon said news organisations should be embarrassed and humiliated by their failure to anticipate mr trump's election victory. the new president of the gambia, adama barrow, has flown back into the country. mr barrow was inaugurated last week in senegal for his own safety while regional leaders persuaded his predecessor, yahya jammeh, to step down. he is now in exile in equatorial guinea. here's alistair leithead. a long—awaited return for the gambia's new president. it is the first time power has

peacefully passed from one leader to another. adama barrow was inaugurated in senegal, when the man he defeated at the ballot box refused to leave. expectations are high. the former dictator yahya jammeh, went into exile last weekend after weeks of pressure from neighbouring presidents. a rare case of african leaders strongly policing democracy. the threat of military action from a regionalforce helped. they now provide security for the new president, still unsure where his army's loyalty lies. now he will need fancy footwork to deliver on all the political promises. it is a poor country. young talent often leaves. this is the gambia's top women's team.

their goalkeeper drowned last year trying to cross the mediterranean. she was 20 years old. her brother thinks she may have hoped to play in europe and so joined a well—trodden path. thousands of people go. why? what we believe is that we want to be out and do something for ourfamily or something like that. who knows, to be honest? in villages all across the gambia, many, many people are taking what they call here the back way to europe. starting here they cross into senegal, through mali, through burkina faso to niger, where they head north through the sahara desert to libya and from there they try to cross the mediterranean into europe. fancy new houses built in poor villages show what reaching europe means. money sent home makes a huge difference here. it is a big incentive. this man is 26.

he tried and failed. the family supported his plan to migrate and were disappointed when he came home after a terrible experience. it was so hard. kidnapped by criminals, he was imprisoned for one month and then stranded with no money in southern libya he asked the un help him get home. there is hope here that a new president can revive the economy and remove the need for young people to leave. but it will not happen overnight. in other news: the philippines has reversed its stance on us bases — announcing the united states will now upgrade and advance its facilities on bases in the country. last year president duterte had said he wanted us troops to leave his country and called for an end to alljoint military exercises in favour of building closer ties with china. the authorities in austria say they've detained 11 men and three women suspected of belonging

to the islamic state group. the arrests came after raids in vienna and the southern city of graz involving around 800 officers. the russian government is sending a super tanker aircraft to chile to help the country fight the worst wildfire in the country's modern history. the series of fast—spreading fires mostly in chile's central region, are being fanned by strong winds, high temperatures and a prolonged drought. 0ne town — santa 0lga — has been completely destroyed by the flames. stay with us on bbc news — still to come: we are 30 seconds closer to armageddon. peace activists have moved the clock closer to midnight. the shuttle challenger exploded soon after liftoff. there were seven astronauts on board, one of them a woman school teacher. all of them are believed to have been killed. by the evening, tahrir square, the heart of official cairo, was in the hands

of the demonstrators. they were using the word "revolution". the earthquake singled out buildings, and brought them down in seconds. tonight, the search for any survivors has an increasing desperation about it as the hours pass. the new government is firmly in control of the entire republic of uganda. moscow got its first taste of western fast food as mcdonald's opened their biggest restaurant in pushkin square. but the hundreds of muscovites who queued up today won't find it cheap, with a big mac costing half the day's wages for the average russian. this is bbc news. the latest headlines: the white house has said president trump may tax imports from mexico to pay for his border wall. the mexican government warns that will hurt american consumers. the british prime minister has told

an audience of senior american republican party politicians that she's looking forward to talks about a new free trade agreement between britain and the united states. let's get more now on theresa may's visit to the united states. joining us now is kevin cramer, the republican congressman for north dakota in the house of representatives. he was in the audience in philadelphia watching mrs may's speech. thank you for your time. what did you think? i was very impressed. we a lwa ys you think? i was very impressed. we always find particular folks to your country almost poetic but she had substance as well. she talked a lot about renewed relationships and a renewed america and a renewed uk but at the same time had some admonitions for us. a moment when she told all of us and perhaps

president trump through us that we should beware of vladimir putin that he should engage but beware and we grabbed the point rather well. the so—called special relationship barely exists, it is a comfort blanket for the brits and that it is widely overblown. could there be something new? mrs maher said opposites attract. laughter it is interesting, for part of her speech i thought she could be as sister of donald clark but then there were moments when she was opposite and clearly in presentation but i think it was very encouraging. i think there is something there. i think there is something there. i think the president will find her refreshing. he likes that kind of straight talk and the banter.

frankly, i think the talk of a trade agreement... he brought it up at noon and i think a bilateral trade agreement would validate what prime minister made talked about today, the important institution of the nationstate at the important shed a role of leadership in the globe. it was a good message with good balance. i think president trump will be very impressed. it cannot be an entirely comfortable partnership. he has braked about assaulting women and she believes that climate change is real and made worse by human beings and she has already condemned torture. he did not condemn torture he wants to keep all tools on the table when it comes to protecting

american citizens from isis and islamic terror. but he will rely on his experts, the cia and the other intelligence agencies and the defence department to determine what is allowed in the law but his approach to the enemies of the us i think is a big reason why he won. with climate change, it was the one issue that the prime minister raised where she will find the most opposition and notjust with president trump but with within the room. it is an area that there is no unanimity between our leaders but nonetheless, good leaders ring up all the issues. those that we agree on and those that we do not agree on. thank you very much. thank you

for the opportunity and good to be with you. for the last seventy years, the us—based bulletin of atomic scientists has set the metaphorical time on what it calls the doomsday clock. it's their way of measuring, in the age of atomic weapons, how close the world is to total destruction. on thursday, the group announced it was moving the hands thirty seconds closer to midnight — the symbolic moment when it says the earth would face apocalypse. and the reason? the pronouncements of president donald trump. here's spokesperson rachel bronson to explain. perhaps most troubling has been two concerns that are adding to an already challenging global landscape. the first — the first has been the cavalier and reckless language used across the globe, especially in the united states during the presidential election and after, around nuclear weapons and nuclear threats and the second is a growing disregard of scientific expertise, expertise that is needed when it comes to responding to pressing global challenges, including climate change. the ramifications of donald trump's orders on health issues are not limited to the us.

in kenya, doctors are grapping with the president's re—instatement of the so—called mexico city policy, referred to by critics as the global gag rule. that policy bans the use of american funds for groups that provide abortion—related services overseas. bbc africa's health correspondent anne soy reports now from nairobi. it is not business as usual at this clinic in nairobi. the gynaecologist was once charged with murder for providing abortions and says clinics like these could be threatened by the reinstatement of the so—called global gag rule. women need to -- did not have access to contraceptive services and therefore they get pregnant. illegal abortion is big

business in many african countries where laws are generally restrictive. we really talk about it, it is a taboo. many women who procure it go to the back streets. they have great statistics and a study carried out says that out of a thousand women 48th will procure abortion, mostly unsafe abortion and they will have complications. up to 120,000 p. mexico city policy was far side 120,000 p. mexico city policy was farside in 120,000 p. mexico city policy was far side in 1984 by ronald reagan. subsequently president have stopped it. such organisations now fear the

worst for the future. we have projected to see that without funding over1.80 projected to see that without funding over 1.80 million women unintended pregnancies will happen. close to 660,000 abortions will happen. 0ver close to 660,000 abortions will happen. over 10,000 close to 660,000 abortions will happen. 0ver10,000 deaths will not have been averted. there is limited access to contraception. experts say they have not only prevented unintended pregnancies but of helped women's health and this could all be eroded. diamonds, so they say, are forever — and the bigger they are,

the greater and more enduring the value. take the foxfire diamond, the largest to be found in north america. it's been on display at the smithsonian's natural history museum in washington, and jane 0'brien went for a look. this story of the foxfire diamond began 2 billion years ago when it was forged by fire and forces deep beneath the earth. now the largest uncut diamond from north america is being studied by scientists at the national museum of natural history. it looks like a lump of quartz. and you know, i think a lot of people would agree with you. in fact, i'm sure a lot of people if they saw that just laying on the side of the road would probably not even think about picking it up. diamonds are as mysterious at meteorites, both travel through time and space to offer clues about the origins of the universe. this diamonds perilous journey is even more remarkable, as most are destroyed or splintered by the volcanic action that propels them at high speed to the earth's surface. we know by looking at these flat surfaces that there was more was more to this diamond at one time, that during either this violent ascent as part of this vulcanic eruption, or the explosion at the surface, or the mining

operation, something caused this diamond to be broken and these flat faces are the broken cleavage surfaces so someplace — someplace — there are other pieces to this diamond. we better get hunting. we better get lucky. we do not know if this is the biggest or the smallest piece. but somewhere there are other pieces. that would fit onto these flat surfaces. the fox via was discovered in one of the most inaccessible parts of the world, in the barren lands of ca nada's parts of the world, in the barren lands of canada's north—west territory ‘s. 130 miles from the arctic circle. the mine spent most of the year president. last year it was sold to a businessman and collect. can i hold it? of course, of course. you are holding history. history that is very heavy. it is a

miracle of nature. how much did you pay for it? millions of dollars. how many? i cannot do vaults that. i feeling quite nervous. he plans to keep the diamond in its rough conditions but anyone hoping to find its missing parts, had better hurry. injust the its missing parts, had better hurry. in just the few years that the mine will close, leaving any treasure buried beneath the ice. they are looking for the rest of it. much more on the website and you can reach me on twitter. thank you for watching. well, while some of us were shivering on thursday,

for others, for example across the north of scotland, it was remarkably mild. a day of contrasts. we are kind of getting back to normal through this weekend. most of us will turn less cold. a bit of a breeze, some sunshine, but there will be some rain around, too. we are losing the continental feed which brought most of us a very cold day on thursday. we are doing to start to drag air in off the atlantic, and hence that rise in temperatures for the majority. but we start the day with a hard frost, one or two freezing fog patches, and the odd shower as well, which could cause some icy stretches. it should be a dry start across wales, that fog up over high ground, but that will be lifting, and the temperatures will be on the rise, above freezing for northern ireland. rain knocking on the door of the west of the province. a frosty start for most of scotland. and here i think it is set to be a largely dry day, with some sunshine. heading our way down, across the borders into northern england, cold with a hard frost, some freezing fog patches for sure in the morning, so watch out for those.

i mentioned the odd showerjust spilling into eastern counties for a time in the morning, so the risk of one or two icy stretches. but temperatures slowly rising above freezing. down across southern england and into the south—west, we should be above zero. a dry start, but some showery rain lies in wait out west. and this band of showery rain will start to push its way slowly eastwards, across northern ireland and into the far south—west of england, perhaps the far south—west of wales. another little area of showers pushes up across southern england through the afternoon as well. further north and east, it stays dry, but that chilly air holding on for one more day. just two degrees there in newcastle. milder, though, across many southern and western areas. as we head through the evening and night, it gets a bit messy. there will be areas of rain pushing their way northwards and eatwards. some of that quite heavy, actually, some quite wet weather, and a period of snow up over the higher ground of scotland, in particular. but something a little bit clearer will folllow on behind. temperatures could dip

late, close to freezing. but for most of us, actually, it will be a frost—free start to the weekend. saturday starts with cloud and some patchy rain, continuing to move northwards and eastwards. behind that, it turns brighter but also with some showers. and one or two of those showers could be wintry up over the high ground. but it will not be anything like as cold as it has been for most of us. double figures in a few southern areas. that milder theme continues into sunday. we could see an area of rain pushing into southern areas. how far north that gets is open to question. best of the brightness on sunday will be further north across the uk. milder than recently. i'm mike embley. the latest headlines from bbc news: the white house has said president trump may impose a tax of up to 20% on imports from mexico to help pay for his planned border wall to keep out illegal immigrants and drugs. the mexican economy minister has said the idea won't work because it willjust put up costs for american consumers. also the idea is non—negotiable.

the british prime minister, theresa may, has said britain and the us should not return to what she called the failed interventionist policies of the past. now it's time for panorama. legal highs. they're the drugs that have been causing havoc for nearly a decade. police, police! people thought because they were so—called "legal highs" as opposed to the dangerous substances that they were, that it was legitimate to take them. linked to 204 deaths in 2015. it was only like a 10% chance of survival. they thought she'd be brain—damaged. they have devastated life after life. i started dabbling in it and then i ended up hooked on it and then i lost everything. death comes to mind when i hear the word "legal high." britain has the largest legal—highs market of any country in europe. in may last year, the government passed a law banning them, hoping to stop a problem that was getting out of control.

jack's been identified by cctv and suspected of dealing and selling