Senior US intelligence officials have agreed to be interviewed by investigators working for Robert Mueller, a respected former Federal Bureau of Investigation chief, according to reports in both The Washington Post and New York Times.
Mark Corallo, a spokesman for Trump's personal lawyer, had responded Wednesday evening to the Post report by saying: "The FBI leak of information regarding the president is outrageous, inexcusable and illegal".
The obstruction of justice investigation into the president began days after Comey was sacked on May 9, according to people familiar with the matter.
Mueller was named by Rosenstein on May 17 to lead the Russian Federation investigation as a special counsel, a position created to conduct investigations when a normal Justice Department probe would present a conflict of interest.
The attorney general stepped aside from the Justice Department probe into Russian meddling in the campaign on March 2, the day after The Washington Post reported on two previously undisclosed meetings with Russian Ambassador Sergey Kislyak.
According to a Washington Post report, the move to investigate President Trump's conduct marks a major turning point in the investigation, which until recently focused on whether there was any coordination between the Trump campaign and Moscow.
Comey also testified he had told Trump he was not under investigation.
After Mr Comey's testimony, Mr Trump said he had been vindicated because his former FBI director confirmed telling Mr Trump on three occasions that he was not under investigation. The investigation has been cloaked in secrecy and it's unclear how many others have been questioned by the FBI. White House officials said the president is not considering such a step.
Wounded NCCU alum throws out first pitch at Congressional Baseball Game
President Donald Trump praised Bailey and Griner in a video message that played before the start of the game. A lone gunman opened fire during the early morning on a group who were practicing on the field.
But after Comey testified to Congress last week about what he said were Trump's attempts to get Comey to publicly exonerate him, Kasowitz maintained that Trump "was not under investigation as part of any probe into Russian interference".
On Thursday, Russian President Vladimir Putin said Comey had presented no evidence to prove that Moscow meddled in the USA election, adding that Washington had tried to influence Russian elections "year after year".
It is unclear whether Ledgett had direct contact with Trump or other top officials about the Russian Federation probe, but he wrote an internal NSA memo documenting the president's phone call with Rogers, according to officials.
"I don't think it's necessary for us to meet (again)", Burr said.
When asked whether he thought Trump had obstructed justice, Comey told West Virginia Senator Joe Manchin, "I don't know".
A spokesman for Mr Mueller declined to comment.
The Senate committee has already begun taking testimony in both closed and open sessions from the nation's intelligence chiefs. The request specifically asked for "copies of all records of notes taken by or communications sent from FBI Director James Comey" regarding those interactions.
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