Sessions has been dogged by questions about possible additional encounters with the ambassador, Sergey Kislyak.
On Tuesday, Democrats and Republicans expressed concern about Mueller's fate and advised the president that he would be making a big mistake by firing him. He lashed out at a top Justice Department official overseeing the inquiry, reflecting his mounting frustration with the unrelenting controversy that has consumed his early presidency.
Trump reportedly became aware of the longtime relationship between Mueller and Comey after being alerted to reports on Breitbart News and other conservative media outlets. Comey declined to elaborate in an open setting.
ABOARD AIR FORCE ONE President Donald Trump has the right to fire special counsel Robert Mueller, who is investigating alleged Russian meddling in the 2016 USA election and possible ties to the Trump campaign, but has no plans to do so, White House spokeswoman Sarah Sanders said on Tuesday.
Rosenstein handed the reigns of the investigation over to Mueller last month not long after Trump abruptly fired FBI director James Comey, cutting short his 10-year term. Sessions says he was there for a speech by then-candidate Donald Trump and members of Sessions' staff were also in attendance. But the president and his aides have not definitively said so.
"I appointed him and I believe it was the right decision and I'm going to stand by that", Rosenstein said.
His morning missive apparently referred to Rod Rosenstein, the deputy attorney general whose role leading the federal investigation has become increasingly complicated.
Acknowledging the limits of his own authority, Rosenstein suggested to a Senate panel on Tuesday that he wouldn't just take marching orders from Trump if asked to do something that's not prescribed in the regulations.
Rosenstein made the remark at a hearing before the House and Senate Budget Appropriations Committees after being asked by Republican Sen. Chris Van Hollen of Maryland called it the "height of arrogance" for Sessions not to be present.
Mueller was appointed by the Justice Department to helm the investigation after Trump abruptly fired Comey - who was the one previously leading the Russian Federation probe - in early May.
The Senate Intelligence Committee hearing is the latest step in multiple ongoing investigations into Russian meddling in last year's US presidential election.
"I think he's weighing that option", Mr Ruddy said in an interview on Monday with Judy Woodruff of PBS NewsHour.
Spicer did not outright discount the notion of removing the special counsel, but he noted Ruddy was not a spokesman for Trump.
Rosenstein also said Sessions is not involved in the Russian Federation probe and has not been briefed on it since his recusal.
"For Mr. Trump, the line between whim and will is always thin".
"I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director!"
Rosenstein, who has been on the job for six weeks, described Mueller as operating independently from the Justice Department in his investigation into whether the Trump campaign coordinated with Russian Federation in the 2016 presidential election.
But during an afternoon hearing, Sessions suggested to the Senate Intelligence Committee that Mueller could be trusted to carry out a fair investigation.
The revelation came after Ruddy was at the White House on Monday for a meeting with Chief Strategist Steve Bannon.
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