Senators Claire McCaskill and Dick Durbin told reporters that Rosenstein learned Trump's intention on May 8, the same day that POTUS asked Rosenstein and Jefferson Beauregard Sessions III to "explain in writing the case against Comey".
Trump referred to Comey's testimony at a recent Capitol Hill hearing after which the Justice Department ended up having to amend part of his testimony regarding last year's probe of Hillary Clinton's email practices.
But Sen. Marco Rubio said he believes the two investigations will be able to exist side-by-side. "That included ... CIA, FBI, Mueller, and it included also the deputy attorney general at the time, James Comey".
President Donald Trump later acknowledged that he had already thought about dismissing Comey and that he was perturbed by "this Russian Federation thing", fueling criticism that Rosenstein's memo merely served as a pretext so the president could fire a law enforcement official conducting an aggressive investigation into his campaign.
At a press conference later on Thursday, Trump said, "I respect the move but the entire thing is a witch hunt".
"The problem is all this stuff here at home is going to follow him overseas", said Sen. He misspelled the word "counsel" on Thursday. Mueller detail-oriented investigative approach, his bureaucratic acumen (he saved the Federal Bureau of Investigation from being smashed like a hammer after the September 11th attacks), and his sterling reputation across both sides of the aisle mean that it would politically perilous - in addition to legally treacherous - for the Trump White House to be seen as not cooperating with the probe.
Mr Mueller grew up in Philadelphia and went to St Paul's School, the elite prep school in New Hampshire, where he played hockey with former secretary of state John Kerry.
We contacted all three members of the delegation to get their thoughts on the situation. Today, according to the same administration, he's launched the biggest witch hunt in USA history.
"You're pretty well knocked out of the game", he said about the ongoing high-profile congressional probes, "and that's probably the way it should be". "I think we have a very divided country because of that and many other things".
"I would be very discouraged if somehow this new special prosecutor would preclude Jim Comey from testifying in public before our committee", he said.
UPDATE (4:13PM): Trump continues to trash Rosenstein's decision, calling it a "very, very negative thing".
Rosenstein had much to cover in the long-awaited Senate briefing, including the Comey firing, the naming of a special counsel and the Russian Federation probe itself.
There had been debate, even with Rod Rosenstein, about whether or not special counsel was necessary.
"If there is obstruction of justice, perjury or false statements made in connection with that investigation", Zeidenberg said.
Meanwhile, Senate Democrats met in private Wednesday to brainstorm how they were going to grill Rosenstein - including pressing him to name a special prosecutor. "My decision is not a finding that crimes have been committed or that any prosecution is warranted". Rosenstein threatened to resign from the Justice Department because of the explanation that White House officials were giving reporters about the firing, said the person close to the White House, who spoke on the condition of anonymity.
Republican Richard Burr, chairman of the Senate Intelligence Committee, said Flynn's lawyer told the committee he would not honor the panel's subpoena seeking relevant documents.Russian Federation has denied US intelligence agencies' conclusion that it interfered in the election campaign to try to tilt the vote in Trump's favor.