According to NBC's live tracker, external, Robert Mueller has deflected or declined to answer questions 173 times so far during Wednesday's hearing.

Virginia Republican Ben Cline tells BBC News that today's hearing is just about a few Democrats in Congress pushing to impeach Trump.

Natalia Veselnitskaya met with the Clinton campaign more times than she met with the Trump campaign, claims Republican Devin Nunes.

Veselnitskaya is the Kremlin-linked lawyer who had a 20-minute meeting at Trump Tower in June 2016 with members of the Trump campaign.

Members of Trump's team later lied about the meeting, claiming it was held to discuss Russian adoptions. The true purpose, which Trump's team later admitted, was to hear dirt on Hillary Clinton that Veselnitskaya claimed was being offered by the Russian government.

Nunes claims, but Mueller does not confirm, that she met repeatedly with the head of Fusion GPS, the company that commissioned the Steele Dossier alleging Trump ties with Russia.

Nunes points out that her name is mentioned 65 times in Mueller's report.

Image source, Getty Images

BBC journalists comment on Mueller's lacklustre performance.

Mueller agrees Wikileaks is "a hostile intelligence service". He says Trump's tweets about Wikileaks were "problematic".

"Problematic is an understatement," he says.

The Washington Post calls Mueller's statement about Wikileaks "the most pointed criticism of Trump's behaviour since beginning" his testimony.

So what is Wikileaks? Read our explainer here.

And here's a breakdown of some of the biggest document drops.

Democrat Mike Quigley points out that a president who serves two terms could serve past the statute of limitations for a crime, and is thus above the law in some way.

Mueller says he isn't completely aware of the statutes or if that would be possible.

Quigley says he just wants to point that out ahead of an election year, as many Americans may be hearing these details for the first time.

Utah Republican Chris Stewart says he agrees with his colleagues that no person - even the president - is above the law.

But he says that colleagues are forgetting that all citizens also deserve the presumption of innocence.

He says that the investigation has no basis in reality, and is just based on the desire of Trump's opponents for the claims to true.

Mueller says that he worked as quickly as he could because any "lengthy, thorough investigation" would hang a cloud of guilt over the accused until they are cleared.

He also pushed back against Stewart's claims that Mueller's team leaked information to the press.

When asked what he would want the US public to know about his report, Mueller says it is "a message to those who come after us".

He says it's also "a signal, a flag to those of us who have some responsibility in this area...don't let this problem continue to linger as it has over so many years".

Image source, Getty Images

Republican Mike Turner asks: "Does the attorney general have the power or the authority to exonerate?"

He then whips out a copy of the Constitution and US legal code from Mueller's own law school to make a point that there is no mention of exoneration.

"Would you agree with me that the attorney general does not have the power to exonerate?"

Mueller passes on it. "I'm not prepared to deal with a discussion in that arena."

Turner continues to say Mueller has no power to tell the attorney general about exonerating the president or not.

Mueller says he included the line on exoneration in the report to inform the attorney general, William Barr.

"I don't think you put that in there for Mr Barr," Turner says. "In our criminal justice system there is no power or authority to exonerate."

"You had no more power to declare [Trump] exonerated than you had to declare him Anderson Cooper."

Turner says it's a "meaningless word" that has "coloured" Mueller's whole report, and ends his questioning.

After Mueller attempts to throw a question to his aide, Aaron Zebley, Republican congressman Brad Wenstrup says that he does not want to hear from Zebley.

"This is your report," he tells Mueller, refusing his request to speak to Zebley, who has been sworn in as a witness at today's second Mueller hearing.

Devin Nunes, the top-ranking Republican on the committee, said in his opening statements that Republicans object to Zebley's role today and do not intend to ask him any questions at all.

Robert Mueller has mostly steered away from supplying soundbite-worthy quotes. Instead, he has repeatedly directed lawmakers back to his written report, refusing to read from it himself.

His halting testimony has involved frequent pauses and requests for clarification from lawmakers.

According to analysis by Politico, external, throughout his testimony Mueller has:

• Asked lawmakers to repeat their questions 23 times
• Directed lawmakers back to his report 31 times
• Said the questions were outside his “purview”10 times
• Said he “can’t” or “won’t” get into the substance of the question 58 times

Alabama Democrat Terri Sewell is asking about the "infamous" 9 June 2016 meeting at Trump Tower, which was attended by top Trump campaign officials after a Russian lawyer offered damaging information about Hillary Clinton.

Mueller won't say if the meeting was an illegal campaign contribution.

But he answers "generally speaking yes" when asked if it is illegal for a presidential campaign to accept foreign campaign help.

He says the Trump campaign never told the FBI about the offer of help from a Russian lawyer.

Sewell asks if it is the duty of a campaign to inform the FBI of foreign offers of assistance.

"I would think that that is something that they would and should do," says Mueller.

Republican Mike Conaway asks if anyone asked Mueller to exclude things that he believed should have been in the report. Mueller says not that he can remember.

Conaway yields his time to fellow Republican John Ratcliffe.

"You [have] spent the last few hours of your life with Democrats trying to get you to answer all sorts of hypotheticals about the president," Ratcliffe begins.

"I guess regardless of that, the special counsel's office is closed and it has no continuing jurisdiction or authority, so what would be your jurisdiction or authority to adding new conclusions?"

"I don't know or expect changes in conclusions that we included in our report," Mueller says.

Ratcliffe also repeats Mueller's correction of his response to Democrat Ted Lieu this morning, and Mueller confirms: "We did not make a determination with regard to culpability."

Connecticut Democrat Jim Himes thanks Mueller for the "remarkable clarity and power" in his opening statement in which he states that Russia did attempt to influence the US election in Trump's favour.

He points out that Trump has frequently cast doubt on Russia's alleged role in attempting to help him.

Himes asks if Russia's role had an affect on the election.

"Those issues have been investigated by other entities," Mueller says, adding that he will not speculate on Russia's impact on voters.

Image source, Reuters

Nunes says Mueller's investigation failed to interview everyone involved.

Nunes says the investigation was not opened on intelligence but on rumours about a conversation between academic Joseph Mifsud and George Papadopoulos.

Nunes points out Mifsud has been pictured with western leaders, including Boris Johnson, the new UK prime minister.

"I stand by that which is in the report and not so necessarily which is not in the report," Mueller says.

"Mifsud waltzed in and out of the US...but the FBI failed to question him for half a year after officially opening the investigation," Nunes continues. "Once Mifsud finally was questioned, he made false statements to the FBI. But you declined to charge him."

Mueller says he won't speak to the series of happenings as Nunes articulates them.

"You did not indict Mr Mifsud?"

"True," Mueller says, and that's the time limit for Nunes.

People associated with the Trump campaign were trying to make money after Trump won the election, and during his transition into the White House, Mueller agrees.

Congressman Schiff asks if Trump was trying to make money by building a Trump Tower in Moscow, and Mueller says yes.

Mueller is now answering "yes", after Schiff lists various members of Trump's team who have been found guilty of lying to Congress or investigators.

"It is not a witchhunt," Mueller says about his own investigation, in a direct rebuke of Trump's characterisation of his work.

As Mueller’s testimony before Congress continues, Democrats and Republicans alike have seized on a potential fundraising opportunity.

President Trump, the Democratic Senatorial Campaign Committee and the National Republican Congressional Committee are among those trying to use today’s testimony as a cash grab in advance of the 2020 election.

Image source, Twitter

Image source, Twitter

Image source, Reuters

Schiff's questioning brought up Paul Manafort - Trump's former campaign chair.

The former political consultant had worked on Republican presidential campaigns as far back as Gerald Ford's in 1976, and for clients around the world. It was hoped his 40 years of political experience would help temper some of the chaos and controversy surrounding Mr Trump.

However, he ended up falling prey to the controversy his appointment was intended to stifle.

He was convicted on eight charges of tax fraud, bank fraud and failing to disclose foreign bank accounts and sentenced to nearly four years in prison.

Read more on the man who helped Trump win here.