this is bbc world news today. i'm kasia madera. our top stories: 20 us states file a motion to stop billions being sent to build donald trump's well as he has to the southern border to make a case for it. our country is full, our area's full. the sector is full. can't take any more, i'm sorry. britain's terminus to request another brexit extension until the end ofjune, and says the uk will make preparations to take part in the european parliament elections just in case. cracking down on illegal images of children in africa. we have a special report on a new unit jacqueline africa. we have a special report on a new unitjacqueline tiled —— tackling child abuse in kenya. this is the first arrest of its kind

ever to take place in africa. the comedian who is now a front runner in ukraine's presidential election challenges opponents to a stadium debate and a blood test. the president says yes to both. hello and welcome to world news today. we will bring you up—to—date with brexit but we are going to start the programme in california, because donald trump is there visiting an area along the border with mexico. he continues to make the case for his wall. he touched down just over an hour ago at a us naval facility. his trip comes as 20 us states have filed a motion to block the president's attempts to fund the wall using billions of dollars from the department of defense budget. his plan involves diverting the money having declared his plan involves diverting the money, having declared a national emergency. but, speaking at a round—table event

at a us border patrol facility in calexico, he had this to say. it's a colossal surge, and it's overwhelming our immigration system, and we can't let that happen. so as i say, and this is our new statement, the system is full. can't stick you any more. whether it's asylum, whether it's anything you want, it's illegal immigration. can ta ke want, it's illegal immigration. can take you any more. we can't stick you. our country is full. our area is full. the sector is full. can't ta ke is full. the sector is full. can't take you any more, i'm sorry. can't have it. turn around. that's the way it is. the president there. he was speaking a short time ago and he is still talking right now. but we are going to cross over life to washington to ta ra to cross over life to washington to tara mcelvey, art reported there. the president, you can sense his frustration. he is exasperated.

president trump talks a lot about democrats stopping him doing what he needs to do for our country. in his mind, he's been persecuted and thwarted by the democrats and this is an example of it. officials say these states, including new york and california can say the wall is unnecessary. he has done on the border. he will be visiting the area very shortly. we will hope to bring you life pictures of that. not much has actually been built, is it? what has actually been built, is it? what has been built, a 30 foot high structure that has holes in it, slats ended, and he will talk about the future. he said there will be 400 miles of all that will be built andi 400 miles of all that will be built and i imagine he will describe how it is done, and he is going to show

the way the border is being secured and fortified, and he's going to explain to america he's keeping the country explain to america he's keeping the cou ntry safe explain to america he's keeping the country safe in the border will be sealed, secured. tara, thank you very much. tara mcelvey. while donald trump was on the way to mexico, one of the people challenging him probably for the presidency was facing some issues. joe biden served as vice president under barack obama — and while he's not yet formally declared his candidacy, he's hinted that he'll do so very soon. however, this week, allegations have emerged that he inappropriately touched two women. he's denied any wrongdoing. look, the fact of the matter is i made it clear if i made anyone feel uncomfortable, i feel badly about that. it was never my intention. but

there are some who want to hear directly "i am sorry". i am sorry i did not understand more. iam not sorry for any of my intentions. i am not sorry for anything i have ever done. i have never been this respectful intentionally to a man or a woman. joe biden, a little earlier. another day, another delay or at least a request for one. the british prime minister wrote a letter to the european council president donald tusk requesting an extension to date tojune tusk requesting an extension to date to june 30 if tusk requesting an extension to date tojune 30 if needed. the letter also requested an option to leave earlier if a deal is agreed and parliament. the letter accepts no agreement means that the uk prepares for you european elections... that is something theresa may has been desperately trying to avoid. there has been suggestions a longer extension may be more palatable to

that you —— to the eu. donald tusk... cutting it short if the european limit ratifies it in for some the british foreign secretary jeremy hunt says nobody wants a long delay. we still hope to leave the you in the next couple of months. that is our ambition. we don't have a majority in parliament and that means we have to have those discussion with jeremy means we have to have those discussion withjeremy corbyn to see if there is enough common ground to do that. supporting conservative np jacob reese mogg doesn't like the extension and he has responded to donald tusk‘s suggestion with a tweet in which he says... to which the european parliament's press according nader replied ——

european parliament's. .. he signs it off with a winky emojis face. the irish cup minister says the extension might be better to avoid further uncertainty. nobody wa nts avoid further uncertainty. nobody wants no deal. we also wants to avoid rolling extensions where there is an extension every couple of weeks and every couple of months. that is uncertainty for businesses and forfarmers. that is uncertainty for businesses and for farmers. perhaps a longer extension makes more sense but that is something i have to talk about with other heads of government and also prime minister may. let us bring all of this together with our european correspondence damian

grammaticas. what we have heard from european capitals is a degree of skepticism about what they have seen in the letter theresa may has sent asking foran letter theresa may has sent asking for an extension. the eu leaders from the different countries have said that they do not yet believe that there was a credible land that they have seen from the uk. that is one of the conditions they put forward. mrs may does meets on the other conditions. she says the uk will prepared to hold european elections if necessary and also act asa elections if necessary and also act as a constructive member of that you going forward, but what the dutch pa rt going forward, but what the dutch part minister said today was that he saw only half a plan of mrs may's letter. he said he had been expecting it to lay out a credible reason why the uk should be granted more time and he been not believe it'd answer that question. from france, what we heard is the french government saying they did not think

there was any plan at all in this. mrs may's idea of securing either agreement with the opposition or a vote in parliament, it seems the eu is sceptical what that might deliver. what the dutch part minister was saying is he thought mrs may had a lot of work to do. he thought there would be extensive phone calls with european capitals in the coming days and perhaps when mrs may comes to that summit, she will still at that point have to convince european leaders. it is worth saying, all indications are that all want to avoid a no deal exit from the uk. the question is how long an extension that would grantand how long an extension that would grant and how tough it will be. damian grammaticas in brussels. brace yourself for... the un secretary—general antonio

geter is... he had been meeting khalifa haftar in the city of benghazi, in an attempt to avoid what he called a bloody confrontation. but general haftar reportedly told him that his advance on the capital city of tripoli, where the internationally—recognised government is based, would continue until — he said — "terrorism had been defeated." i still hope it will be possible to avoid a bloodied confrontation in and around tripoli. whatever happens, the un will remain committed, and i will remain committed, and i will remain committed, to support the libyan people. libyans committed, to support the libyan people. libya ns deserve committed, to support the libyan people. libyans deserve peace, security, prosperity and the respect of their human rights. the advance by general haftar‘s forces are continuing. they have in moving far to the east moving ever closer to

tripoli. these are the areas around the city which they claim to have taken. there has also been fighting around the former tripoli international airport on the southern outskirts of the capital. earlier, i spoke with the bbc‘s arab affairs editor sebastian usher. this advance was launched just a couple of days ago. haftar told his forces to essentially lift tripoli. they have made progress. coming in from the west and the south. in the south, what they are saying, hafta r‘s south, what they are saying, haftar‘s forces south, what they are saying, hafta r‘s forces come south, what they are saying, haftar‘s forces come is they have taken the airport, they have taken villages. i think we have to be careful... it has to be close to the outskirts of tripoli in that area to the west, where they have also been trying to come across. they have met fierce resistance. they have been

pushed back by forces recognised by the government... tell me who this is. haftar was close to caddell fee. he was a military commander way back. he tried to overthrow, did not work, he went into exile. he came backin work, he went into exile. he came back in 2011 as the revolution was under way. he was one of the lives of the military in that revolution. he became the commander of the military under the previously internationally recognised governments, which was forced out to the east, and is now seen as a rival governments to the one that the un, the national unity government put in place. he took benghazi under the banner of driving the jihadists, the images miss —— islamists out. he has

taken the south. it is strategically located. he is in the moments controlled... he is a very powerful figure. he has been spoken as a strong man, as a warlord, and he has some backers from the outside, notably the united arab emirates, egypt, russia, the russia today is saying it is absolutely against any military solution to what is going on. and he has been seen as a serious figure, someone who needs to be included in however this chaos in libya is sorted out stuff i think the sense was that he was doing this in order to bolster his position ahead of a conference coming up to try and look at the future of libya. he felt he was being pushed aside, and this was to show that he is someone and this was to show that he is someone who has to be reckoned with and has to have a key role, but it

may well be going further than that and it may notjust be rhetoric. it may be he has his sights set on tripoli. militarily, unless there are big defections, they can probably keep him out but that could change the sebastian usher there on that advance on tripoli. stay with us on that advance on tripoli. stay with us on bbc world news. much more to come. more about the comedian who is now the front runner in ukraine's presidential election. he challenges us presidential election. he challenges us down the —— he challenges his opponents to a stadium debate and blood tests, and the president says yes to both. 25 years of hatred and rage,

as theyjump up on the statue. this funeral became a massive demonstration of black power, of power to influence. today is about the promise of a bright future, a day when we hope a line can be drawn under the bloody past. i think that picasso's works were beautiful, they were intelligent, and it's a sad loss to everybody who loves art.

president trump is visiting his wall as 20 us states block the funds devoted. leaders say they are relu cta nt to devoted. leaders say they are reluctant to agree another short delay to brexit without a credible plan from britain. they may prefer a longer extension. a brand new cyber unit, designed to crack down on images of child six abuse in africa, is coming into force. a kenyan police unit trained and part funded by british authorities has begun the first ever operation on the continent, to arrest people downloading and sharing obscene images of children. angus crawford sent this report from kenya. a new unit on its very first operation. exposing what was,

until now, a hidden crime. a target identified. a home searched. a phone seized. this is the first arrest of its kind ever to take place in africa. these officers are detaining this man after a cyber tip from the american authorities, and he's been charged with downloading and sharing images of child sex abuse. evidence to be analysed in a brand—new facility with expert help. and all this because of training and funding from the british taxpayer. so this unit are leading the way for the rest of africa. they are trailblazers. we are receiving 60 to 100 referrals a day from the national centre for missing and exploited children. some of the material that we are receiving, videos and imagery, is the worst i've seen. and the new unit will target abusers wherever they find them.

these beaches draw in thousands of children fleeing poverty in the countryside, and here they meet wealthy foreign tourists looking for cheap sex. children hovering around, looking for tourists, looking for men. william tries to rescue the vulnerable. this isjust a mile from the beaches. the locals call it sin city. bustling by day — after dark, it changes. sex workers line the streets and in the shadows, children. we find vicky, who's just 15. yes, i have 15. you are 15? yes. too scared to look at me. she's only been doing this for three weeks and wants 2,000 shillings. that's £15. let's go for short time. short time is 2,000. we take william back to meet her.

can william help you maybe to stop, give you a better life? it's the same story on the beach. we ask a barman to help us find a girl. within ten minutes, she arrives. she is very young, says she's an orphan, and doesn't even have money for food. translation: when my mother died, that's when i stopped studying. the youngest we've had, ever i've come into contact with was 12 years. and the mother asking her to go out and bring some food. but abuse can also mask itself as charity. this is mary, sexually exploited by a foreign tourist for years. he groomed her family with gifts and money. her mother is angry, bitter. what do you think of the foreign men

who come here to hurt children? translation: i think they come here because they can do whatever they want to. and nothing will happen to them. kenya's new police unit is determined that will change. angus crawford, bbc news, nairobi. you can see angus's report again on our website. let's take a look at some of the other stories making the news. activists in saudi arabia say eight people been detained. this is the first round of arrests of perceived critics of the crown prince, mohammad bin salman, since the coming of the journalists jamal khashoggi. the world bank has approved the comments from the us treasury as its new president. the organisation said the appointment of david malpass

organisation said the appointment of david m“ he 5s organisation said the appointment of david m“ he is the 13th american in process. he is the 13th american in a row to be given the job. process. he is the 13th american in a row to be given thejob. an inquest into two bombings in the english city of remain him in 1974 has found that a botched warning call by