Speaking to the reporters outside White House before leaving for the World Economic Forum in Switzerland, the commander-in-chief said he was open to testify to Mueller's team, which is now conducting a probe into Trump campaign's ties to Russian operatives. "I don't know what's the big deal with that". He is the first sitting USA president to do so since Bill Clinton 18 years ago.
Mueller's investigation was initially focused on Russia's alleged attempt to interfere in the election. Three are run by congressional panels.
So far, witness interviews and the special counsel's document requests make clear Mueller has a keen interest in Comey's 9 May firing and the contents of Comey's private conversations with the president, as well as Flynn's ousting months earlier and the weeks of conversations leading up to it.
What is the president being interviewed about?
When Comey testified before Congress last June, he said that he had a friend of his who worked at Columbia Law School give the contents of his memo to a reporter.
As Mueller investigates Trump for possible obstruction of justice of the Russian Federation probe, the potential interview could be a legal minefield.
If Trump is questioned, he'll likely be grilled about his firing of FBI Director James Comey and Comey's claim that Trump asked him to stop investigating former National Security Adviser Michael Flynn. The fourth was former national security adviser Michael Flynn, who lied to the Federal Bureau of Investigation about his contacts with the Russian ambassador.
He was also in charge of the campaign's team of foreign policy advisors, including George Papadopoulos, who had extensive Russian contacts and tried to set up a meeting between Trump and Russian President Vladimir Putin.
But hasn't the president criticized this investigation?
The president had previously said he thought it "unlikely" he would be interviewed by Mr Mueller. He again made that same pronouncement just two weeks ago.
Ironically, Sessions at one point was technically in charge of the Russian Federation investigation as the head of the Department of Justice.
"I'll see what happens".
Why did Trump change his mind?Politicians, including Republicans, praised the decision at the time, but Trump has publicly rebuked his attorney general and said he wished Sessions had not recused himself.
Will he do it under oath?
He added that Mr Mueller's team and Mr Trump's personal lawyers were working out the arrangements for a meeting.
Who else has been interviewed by Mueller's probe?
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