Democrats in the us house of representatives have stepped up their impeachment inquiry into President Trump. The us secretary of state, mike pompeo, has been ordered to hand over documents to an Oversight Committee in congress. Its trying to determine whether President Trump jeopardized National Security in his dealings with the government of the ukraine. The committee has also ordered five members of mr pompeos staff to give evidence. One of those is this man kurt volker, who in the last few hours, has been reported to have resigned from his position as the us special representative to ukraine. Hes not given a reason. Well find out more about that in a few minutes, from the student journalist who broke the story. First, our north america, jon sopel reports on how President Trump has reacted as the inquiry gathers steam. 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. Sounding more and more like the so called whistle blower isnt a whistle blower at all. 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. 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. David tafuri is an International Lawyer at dentons. He is in our washington bureau. David, thanks so much forjoining us on bbc news. I mean, correct me if im wrong but it is pretty shocking to have to subpoena secretary of state for documents . Well, it is, thats what congress does as part of its oversight, though. It request them and if it doesnt think it is going to get them it has to issue a subpoena. They are anticipating the state department was going to give them trouble and issued a subpoena. The question is will they comply with that . There have been many insta nces with that . There have been many instances where the Trump Administration has refused to comply with subpoenas unless congress trying to figure out how to enforce those subpoenas. What does that mean if they dont provide those documents . What happens next . Then the congress can try to take an action to court to try to hold the administration in contempt. This hasnt happened many times, so its not exactly clear how the process works and what the ability of the judges to enforce a contempt order against the administration. Hopefully were not going to end up there and secretary and the state department will comply with the subpoena. Think that would be wise to do so. And now wheres that leave us to do so. And now wheres that leave us in terms of what we know about the ukraine and that phone call and what the president s involvement was . Well, we have a rough transcript of the phone call and, as in your previous segments, it was described accurately by the whistleblower. We now have the whole whistleblower. We now have the whole whistleblower complaint released publicly. And you can read all the things the whistleblower was reporting. Some of those things he observed. Most of them are things he learned from others in the administration stop at reports a number of concerning facts about how the present reacted with the president of ukraine and we are also learning some concerning facts about how the president was in dealing with other leaders, including leaders of russia. There is now some reporting related to the president meeting with the foreign minister of russia in 2017. Apparently, according to the washington post, the president told the foreign minister of russia that he shouldnt be concerned about the election interference by russia and said something to the effect of we do that all the time, to. It is also a stunning fact, too, if true. All of this has been brought up by this whistleblower complaints, which alleges to suggest that there are many in the administration who are entirely concerned about how the president was interacting with foreign governments and that he was doing a number of Different Things that were jeopardising our National Security here in the us. And, david, the committee has also ordered some of mr pompeos staff to give evidence, one of whom is kurt volker, the us special representative to your grade. And he has now reportedly resigned. What does that mean in terms of him giving evidence in the future . Well, it would be a little bit easier for him to give testimony and evidence if he is no longer a part of the government s. He wouldnt have to get permission from the government, for instance, to give testimony. We dont know if thats the reason why he resigned. And i dont want to speculate about that. But it is at least possible that he resigned in order to free himself from the yoke of the administration so he could testify accurately about what he observed. He is a centralfigure in the whistleblower complaint. He was acting as the envoy between the us and the ukraine. He met with the president of ukraine reportedly and he talked to the president of ukraine after that phone call between President Trump and the president of the ukraine and explain what the president was asking for and help him deal with that. So thatll be fascinating testimony if he does in fact give it. Ok, david tafuri, thank you so much for talking to us on bbc news. Thank you. Here in the uk, its been announced that a Police Watchdog will assess whether the Prime MinisterBoris Johnson should face a criminal investigation over his relationship with the american businesswoman, Jennifer Accuri, during his time as mayor of london. Its alleged that mrjohnson allowed Jennifer Accuri to go on overseas trade missions, for which shed previously been turned down, and that she received about 14,000 in sponsorship money. The Prime Minister vigorously 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 Jennifer Accuri received £11,500 in sponsorship for events organised by one of the 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. 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 concealed 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. 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 have feared for so long is playing out its final active. 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 45 years of division, germany is one. In berlin, a million germans celebrate the rebirth of europes biggest and richest nation. This is bbc news. The latest headlines the United States special representative to ukraine, kurt volker, has resigned after being named in a white house whistleblowers report. Well, lets stay with that story now. Andrew howard is managing editor of the state press, the newspaper for Arizona State university, near phoenix. It was his paper that discovered that kurt volker had resigned. Let me ask you first of all, how did a student paper find this information out . Well, i think the most important thing to us as we a lwa ys most important thing to us as we always try to find a way to localise national issues. We wanted to see why this would be important to our community and we saw that, the 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 affected Arizona State university and our reporting let us do this. What has the university been saying, 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 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 i would be the best person to speak on the Overall International significance of the issue. Any other media approaching you . There must be a lot of demand . My phone has basically been broke on all day, my twitter wont work anymore and ive had a few calls about how we did this. Its a great scoop for you already and youre not even out of university. It is very exciting, im only a junior this year, im not even 21 years old so its very exciting. More exciting for the whole paper, i did not do this alone, we have an amazing staff and im gratefulfor all of alone, we have an amazing staff and im grateful for all of them are helping with all of this. Andrew howard, thank you so much for joining us on bbc world news, great to talk to you. Thanks for having me. Within the next couple of hours, polls open in afghanistan where more than nine Million People are expected to cast their ballots to elect their next president. There are sixteen 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 will soon begin in afghanistans little president ial election. 100,000 security personnel have been deployed to guard polling station in light of a looming taliban threats. The militant group which still controls large parts of the country says there can be no free elections in the presence of foreign Occupying Forces and has spawned violence against anyone who participates. People are scared, according to this voter in jalalabad. They people are scared, according to this voter injalalabad. They want people are scared, according to this voter in jalalabad. They want the Security Forces to work to secure the situation. We are worried 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 resident, ashraf ghani and his power sharing rival, abdullah abdullah, the countrys chief executive. The previous 2014 election was marred by massive corruption in 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, 5000 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. Jon ironmonger, bbc news. A huge crackdown by egypts Security Forces has prevented mass protests from taking place in the capital, cairo. There were online calls for demonstrations against alleged corruption by president Abdel Fattah Al sisi. Instead, it was the leaders supporters who staged rallies in his defence. Human Rights Groups say nearly 2,000 people have been arrested since protests began last week. Sally nabil reports from cairo. It has been a quiet day in cairo so far, although there were calls for huge Anti Government protests. But it seems that the people are too scared to take to the streets, like they did briefly last week. Security presence has been beefed up all around the city. Cars are not allowed into tahrir square, only pedestrians. Weve seen security personnel stopping passers by, checking their mobile phones and looking for their id cards. 0nly small scale protests have taken place in a couple of cities in the south of the city and one neighbourhood in cairo. 0n the other hand, thousands have taken part in pro sisi gatherings in eastern cairo. The president himself has downplayed the significance of the protests that called on him to step down, making it clear egypt is strong and there is nothing to worry about. Its a nervous time, and many are waiting to see what will happen in the coming hours. 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