The Justice Department announced yesterday that former Federal Bureau of Investigation director Robert Mueller has been given sweeping power to investigate Russian interference in the 2016 presidential campaign, including potential links between Moscow and Trump campaign associates.
He added: "The entire thing has been a witch hunt".
"Believe me, there's no collusion".
Across town, Rosenstein was briefing the Senate about his decision to appoint former FBI Director Robert Mueller to lead the independent Trump-Russia probe. "Everybody thinks so", Trump said when asked about the appointment.
Rosenstein has publicly denied being conscious of his reputation, telling a Baltimore business group this week: "I took an oath to preserve, protect and defend the Constitution of the United States".
In a pair of morning tweets and at a later news conference, Mr Trump described calls for his impeachment as "ridiculous" and said he had done nothing to warrant criminal charges. Trump wrote, his anger boiling over.
Rosenstein, who was appointed US attorney by President George W. Bush and held the job for the entire Obama administration, didn't immediately embrace the idea of a special counsel.
Russian Federation has denied U.S. intelligence agencies' conclusion that it interfered in the election campaign to try to tilt the vote in Trump's favor.
Mr Trump categorically denied he asked Mr Comey to drop his probe of Mr Flynn, whom he fired on Feb 14 for misleading Vice-President Mike Pence, about the extent of his conversations previous year with Russia's ambassador.
In this September 4, 2013, file photo, then-incoming FBI Director James Comey talks with outgoing FBI Director Robert Mueller before Comey was officially sworn in at the Justice Department in Washington.
"No. No. Next question", Mr Trump told a news conference when asked if he "in any way, shape or form" ever urged Mr Comey, whom he fired on May 9, to close down the investigation into Michael Flynn. "Because you look at all of the people on the Democratic side, not only the Republican side, that were saying such bad things about Director Comey".
"We look forward to getting this whole situation behind us", he said, vowing to focus his administration´s resources instead on creating jobs, strengthening the military and reforming health care.
At the start of another roller-coaster week in Washington, Trump was accused of divulging highly sensitive classified information gleaned by Israeli spies to visiting Russian Foreign Minister Sergei Lavrov.
Republicans have largely stood behind Trump in the first months of his presidency as the FBI and congressional investigations into Russia's election meddling intensified. "It feels like everything is up in the air, everything is chaotic, and there's some lack of leadership coming from the White House".
"There (were) no facts laid out as to why you would change that, but appointing a special counsel has created, I think, a dynamic for Congress that's going have to be leery of crossing into Mr. Mueller's lane because the possibility of a criminal investigation".
Despite Mr Trump's declarations that there was no conspiracy, Republican Senator Lindsey Graham said the Russian Federation investigation now appears to be considered criminal.
Fighting back against multiple crises has consumed much of the political oxygen inside the White House, leaving Trump's agenda in doubt.
Following Rosenstein's testimony, a number of Senators came out to take about what happened in the closed-door meeting. "That doesn't seize up Congress". "We prosecute tens of thousands of people every year, and every one of those defendants deserves an independent prosecutor".
USA stocks rallied back on Thursday after seeing their biggest drop in eight months the previous day on worries that the political turmoil could sideline Trump initiatives such as tax cuts that investors see as favouring economic growth.
Even if Trump turns things around and becomes a more popular, accepted president, it has to be comforting to markets to know that the sober-minded Indianian is waiting in the bull pen just in case things don't turn out so well.