The special counsel overseeing the probe into Russia's alleged meddling in the United States election is now looking at whether President Donald Trump attempted to obstruct justice, the Washington Post reported, citing unnamed officials.
Robert Mueller's investigation is looking into possible collusion between the Trump campaign and the Kremlin, and is also looking into financial crimes among Trump associates, the Post wrote, citing five unnamed intelligence officials.
The Washington Post and The New York Times both said Mr Mueller was seeking interviews with three Trump administration officials who were not involved in his campaign - director of national intelligence Dan Coats, head of the National Security Agency Michael Rogers and Richard Ledgett, the NSA's former deputy director.
That prompted Deputy Attorney General Rod Rosenstein to appoint Robert Mueller - himself a former Federal Bureau of Investigation director - as special counsel the following week. In sworn testimony before the Senate intelligence committee, fired FBI Director James Comey laid out in stark detail the steps Trump allegedly took to get Comey to back off the Flynn inquiry.
But that changed shortly after Trump fired Comey last May, the Post's sources said.
Comey's testimony comes only a day after two Trump Administration intelligence officials, Director National Intelligence Dan Coats and NSA Advisor Michael Rogers, refused to answer questions regarding conversations they had with President Trump, about the Russian Federation investigation during a separate hearing before the Select Intelligence Committee on June 7.
"The FBI leak of information regarding the president is outrageous, inexcusable and illegal", Mark Corallo, a spokesman for Kasowitz, was quoted as saying.
A spokesman for Mueller's team declined to comment on Wednesday.
Trump allies have accused Mueller of having a conflict of interest.
Comey told the Senate Intelligence Committee on June 8 he believed Trump had directed him in February to drop an FBI probe into former national security adviser, Michael Flynn, that was part of the broader Russian Federation investigation.
"We may have our differences, but we do well in times like these to remember that everyone who serves in our nation's capital is here because above all they love our country", Trump said at the White House.
The interviews could come as early as this week, the Post said.
The news comes one day after Rosenstein affirmed his support for the special counsel, despite recent reports that Trump was weighing Mueller's dismissal.
Russian President Vladimir Putin says former FBI Director James Comey's acknowledgement that he had given memos of his conversations with President Donald Trump to a friend who leaked them to the media is "weird".
Ms Feinstein has said the Judiciary Committee should investigate, but had asked Mr Grassley to keep the investigations separate.
The Senate intelligence committee has also interviewed Johnson in connection with its investigation of Russian activities during last year's election campaign. The investigation has been cloaked in secrecy and it's unclear how many others have been questioned by the FBI.