The Trump Administration is facing fresh turmoil over its dealings with ukraine. The secretary of state mike pompeo has been ordered by the house of representatives to hand over documents as an impeachment investiogation continues. Congressional committees have also summoned five state department employees, including its special envoy to ukraine, kurt volker, who has now resigned. President trump says this is just a witch hunt. Our north america editor jon sopel reports. God bless you mr president. Theres support, theres defiance, but also theres anger. In a twitter fusillade this morning he took aim at the Democratic House chair of the house intelligence committee, adam schiff, the person who will play a key role in impeachment hearings. The Inspector General found that serious allegation of misconduct by the president credible. Donald trump said of him. And then the whistle blower who revealed details of the president s conversation with his ukrainian counterpart volodymyr zelensky. But everything in the whistle blowers letter has been proved true. The call did take place. President trump did ask his ukrainian counterpart to investigate his Democratic Party rivaljoe biden. And the white house today confirmed the transcript of the call was moved to a more secure server. Voiceover but when President Trump asks ukraine to investigate corruption, the democrats want to impeach him. But now in a slick counter blast, the Trump Campaign is firing back. They lost the election, now they want to steal this one. Dont let them. Im donald trump and i approved this. But the speaker of the house is unmoved. She says she was left with no other choice but impeachment following all of this. But this is about National Security. This is about the National Security of our country, and the president of the United States being disloyal to his own oath of office, jeopardising our National Security, and jeopardising the integrity of our elections. And the woman donald trump beat in 2016 has also made a rare intervention to pile in. He has turned american diplomacy into a cheap extortion racket. He has denigrated and lets be honest stabbed in the back of the Career Foreign Service officers who serve bravely and selflessly no matter the politics of the administration that they are working under. The white house line on the whistle blower is that its all second hand information and inaccurate its anything but. So far everything hes said has turned out to be true. Republican lawmakers can say they dont really care and donald trump is free to do whatever he likes, much harder, though, to say theres nothing here. John sopel, bbc news, washington. Angela reddock wright is an employment lawyer and an expert on whistleblower legislation. I asked her how hard it will be to protect the whistleblowers identity. I think it would be difficult not because its necessarily disclosed by anyone in congress or anyone of a higher level. But because in this day and time, its so easy to hack information, to get information, so im sure the leaks have already begun. We dont know already the name of the whistleblower. At least there will be rumours of it. Under whistleblower law, how much protection is afforded . Well, in the traditional sense of the word, they are fully protected against retaliation or against any adverse action that might impact their employment but the reality of this situation is because of the high profile nature of this and the comments that have already been made about the whistleblower, i think it would be difficult to provide protection so im certainly hoping that the federal government is taking all steps to try to essentially put this person into the equivalent of witness protection to make sure they have security full time and they are being looked after, their emails are being protected, theirfamilies are being protected because this is a big deal and obviously, its being considered at a very high level. And this case is interesting, because a federal whistleblower law has never been used against a sitting us president , has it . So what does it mean, there is no precedent for this . It means that this will be an opportunity of first impression, that what happens in congress and what the courts ultimately do, President Trump and his team, have indicated a plan to File Court Action to stay the proceedings. Im not sure thats likely or that a court will find in the president s favour. The president has indicated he plans to use the executive privilege so that he doesnt have to speak to this, and others in his cabinet dont have to speak to it, but im not sure the privilege would extend to this situation. So its a matter of, its unprecedented because we simply havent dealt with this situation before. And so how congress handles it, how the courts handle it will be a matter of first impression. Within the past half hour polls have opened in afghanistan, where more than nine Million People are expected to cast their ballots to elect their next president. There are 16 candidates all of them men including former warlords, ex spies and members of the countrys former communist government. Jon ironmonger reports. After months of delays and continuing conflict, voting has now begun in afg hanistans pivotal president ial election. Tens of thousands of Security Officers have been deployed to guard polling stations under looming taliban threats. The militant group, which still controls large parts of the country, has described the election as a fake american process and has sworn violence against anyone taking past. People are scared, according to this photo. They want the Security Forces to work to secure the situation. We are worried that if we go to the voter centre, there will be explosions, this man says. Most people cant go to cast their ballots. The poll is considered a two horse race between the current president , ashraf ghani, and his power sharing rival, abdullah abdullah, the countrys chief executive. The previous election in 2014 was marred by massive corruption. This time, the government is desperate to claw back some credibility, with biometric fingerprint readers and better training of election officials. In spite of the security concerns, 5,000 polling stations are expected to open, including in remote hillsides where donkeys have been used to transport ballot boxes. A strong turnout is needed to give this election legitimacy but fearfulness and apathy could make that unlikely. We can now speak to bbc afghan reporter Shoaib Sharifi as we were seeing their it is a backdrop of violence and fears of corruption that will be very much at the forefront of peoples minds during these elections . Yes indeed. Both the security authorities as well as the Afghan Independent Elections Commission have got a most dealer track difficult as today, the abilities both of which have been marred by insecurity as well as literally corruption in every single other, fraud and corruption, elections we have had six of them in the last 18 years, but since yesterday, time and again, Afghan Security officials, jointly by the afg ha n security officials, jointly by the afghan election workers, until the very last 30 minutes, were on tv, assuring people that they have enough measures in place to secure these polling centres and that there are enough measures in place so that this election will be fair and acceptable. We are seeing live pictures of a polling station, it is looking empty, but of course it is extremely early in couple where you are. Do you think couple. Do you think the reassurances will be enough to bring people out . Kabull. The voting centres opened almost a0 minutes ago, people, because the level of threat is so real, election voting day security in the capital and provinces have been bad, the threat is very real, but it is early morning, people want to see how real is the security now on the streets of kabul. Perhaps you will see more soldiers and police than voters. In some cities, like jalalabad, one of the most insecure cities, people have started doing an hour before voting centres open, evenin hour before voting centres open, even in some centres, women were seen even in some centres, women were seen waiting for over 30 minutes for the polling centres to open. And in some parts of the country, like in the Southern Province of kandahar, people are waiting but election workers have not arrived. So it seems that people would like, want to wait and see, mostly in terms of security, and also they want there were irregularities in the autumn 2018 elections at the voting centres, so it is early to say how well will be the turn out later about the fear is real and we see a lot of measures across the country, in as well as the capital kabul, several layers of security in order to assure people that they will be safe while casting their vote. Thank you very much. Lets get some of the days other news. Haitian police in the capital Port Au Prince have been attempting to disperse the largest and most violent protests in months. 0fficers used tear gas and live ammunition while demonstrators threw stones. Anger over a nation wide fuel crisis has been spilling over into fury against the political classes and corruption. President moise is trying to calm the situation by offering a unity government. Brazils Environmental Agency says a vast oil slick running across the nations North Eastern beaches did not start in the country. The oil slick now spans over 1500 kilometres, affecting wildlife and polluting some of the nations top tourist beaches. Analysis of the oil shows it was not produced or sold by brazils state controlled oil company. They say its possible the oil could have been spilt by a tanker transporting the crude far from the brazilian coast. Chinas foreign minister has told the Un General Assembly that the trade conflict between beijing and washington could cause an international recession. Wang yi said that building walls between nations would not solve global challenges. Its been announced that a Police Watchdog will assess whether the Prime MinisterBoris Johnson should face a criminal investigation over his friendship with an american businesswoman during his time as mayor of london. Its alleged that as a result of the friendship, Jennifer Accuri was allowed to go on overseas trade missions, and that she received about 1a,000 in sponsorship money. The Prime Minister denies the claims. Downing street has released a statement saying everything was done with propriety and in the normal way. 0ur uk Affairs CorrespondentDaniel Sandford has more. The basis of the allegations is that, while he was mayor of london, borisjohnsons friend, Jennifer Accuri, received £11,500 in sponsorship for events organised by one of her companies, which came from organisations linked to the mayors office. And also went on three overseas trips with borisjohnson which, originally, shed been turned down for. Now, the Greater LondonAuthority Monitoring officer has been looking at these allegations this week and so have we, in fact, and noticed that people who went on the trips with Jennifer Accuri felt that she seemed a bit out of place, as her companies didnt seem as substantial as those of the other people that were on the trips, and certainly we know that borisjohnsons office intervene to make sure that she went on one of the trips and the Greater LondonAuthority Monitoring officer has now decided to call in the Police Watchdog, the iopc, to assess whether Boris Johnson, the Prime Minister, should be investigated for the criminal offence of misconduct ion public office. The iopc are involved because when he was mayor of london, borisjohnson was in charge of londons metropolitan police. Borisjohnson has vigorously denied these allegations, saying to the bbc last night that people are barking up the wrong tree. His office insists that hes always acted with propriety. And he says very proud of his time as mayor of london. Stay with us on bbc world news, still to come 22 years on prince harry retraces his mothers footsteps, walking through a partially cleared angolan minefield. In all russias turmoil it has never quite come to this. President yeltsin said the day would decide the nations destiny. The nightmare that so many had feared for so long is playing out its final act here. Russians are killing russians in front of a grandstand audience. It was his humility which produced affection from catholics throughout the world. But his departure is a tragedy for the catholic church. This man, israels right winger, ariel sharon, visited the religious compound and that started the trouble. He wants israel along to have sovereignty over the holy sites. An idea thats unthinkable to palestinians. After a5 years of division, germany is one. In berlin, a million germans celebrate the rebirth of europes biggest and richest nation. This is bbc world news, the latest headlines the United States special representative to ukraine kurt volker has resigned after being named in a white house whistleblowers report. Mike pompeo has been given a week to hand over documents relating to it. Lets stay with that story now Andrew Howard is the managing editor of the state press newspaper at Arizona State university. I asked him how a Student Newspaper found out about kurt volkers resignation. Well, i think the most important thing to us as we always try to find well, i think the most important thing to us is we always try to find a way to localise national issues. So we wanted to see why this would be important to our community and we saw that, director of the mccain institute, which is an asu programme, kurt volker, was involved so we decided we would pursue it in the way we knew how and await that affected Arizona State university and our reporting led us do this. What have the university been saying about it, if anything . They havent really commented other than saying they cant speak to matters of whether or not he will stay at the university and then confirming that he resigned from his duties as a special envoy. How significant do you think, andrew, his resignation is in all of this . Im not sure i can speak to the significance, im just here to do the reporting and serve the community in any way that i can for Arizona State so im not sure id be the best person to speak on the Overall International significance of the issue. Have you had any other media approaching you about this . There must be quite a lot of demand, right . My phone has basically been broken all day, my twitter wont work anymore and ive had a few calls about how we did this. Surely its a great scoop for you already and youre not even out of university. Its very exciting, yeah. Im only a junior this year, so im not even 21 years old yet so its very exciting. Its more exciting for the whole paper, i did not do this alone, we have an amazing staff and im grateful for all of them for helping with all of this. Police in nigeria have freed some 500 people, many of them young children, from a building where they have been allegedly chained, tortured and sexually abused. To protect their privacy we have decided to conceal the identities of the victims in this report from mayenijones in lagos. Captives in chains, boys, teenagers, and grown men held in a so called Islamic School and unable to leave. Police received a tip off from relatives of children held here that suggested this place was not what it seemed. I say, ok, take this loaf of bread and take it to them. So when we go back home now, we had a family meeting, so we said, ok, the only thing that shall report this issue to the police station. Exactly that is what we did. The police said this was no educational institution. We discovered that we have small, small children, today, underfive graduates. Civil servants i hear. Most of them are chained. Chained as far as im concerned, this is modern day slavery. Millions of students are in Islamic Schools across nigeria. Parents in this deprived region often have to leave their children in religious boarding schools. These institutions have been dogged with allegations of abuse. Earlier this year, the government said it planned to ban them. But wouldnt say when. As the victims are treated and reunited with their families, this latest incident may be a reminder of the need for reform. Mayenijones, bbc news in lagos. Half a million schoolchildren, University Students and adults marched through the canadian city of montreal on friday, in another climate strike inspired by the swedish activist, greta thunberg. The city centre was turned into a sea of demonstrators and placards. 0rganisers said it was quebecs largest ever gathering. Earlier, ms thunberg had met the canadian Prime Minister, justin trudeau. She told him and other World Leaders that they were not doing enough to curb Greenhouse Gas emissions. Large scal