"Witch Hunt" he tweeted from the White House shortly before leaving for Miami.
Mr Trump, who is due to give a speech in Miami on Friday where he is expected to announce a shift in United States policy towards Cuba, also boasted about his deployment of social media, despite warnings by legal experts that his tweets may be used against him in the ongoing investigation.
Robert Mueller, the man chosen to take over the inquest as special investigator, had started investigating into president Trump's behaviour.
If Mueller is investigating Trump's firing of Comey as possible obstruction of justice, he might want to learn about Trump's interactions with Rosenstein, the Justice Department official who wrote the memo criticizing Comey's performance before his firing.
In an interview with NBC's Lester Holt in May, Trump said he made the decision to fire Comey before receiving Rosenstein's letter. Or did Trump fire Comey as a way to stop the Russian Federation investigation from going forward?
Feinstein added, "That's undemocratic on its face and a blatant violation of the president's oath of office". "Regulations way down, jobs and enthusiasm way up!", Trump tweeted.
Kushner's attorney said such a review would be "standard practice".
The tweet came around 9:10 a.m. Friday.
President Donald Trump continued a campaign on Twitter on Friday against the investigations into possible links between his campaign and Russian Federation.
FHP trooper killed in Alachua County crash
Bishop, 52, had parked his patrol vehicle in the inside emergency lane to investigate a crash, according to troopers. A Florida Highway Patrol Trooper died in the line of duty while on I-75 Saturday evening, FHP said in a statement.
It was unclear what report or reports Rosenstein was referencing.
"Americans should be skeptical about anonymous allegations", Mr Rosenstein said.
A Justice Department spokesman declined to comment on the tweet.
Mr. Trump maintains he never colluded with Russian Federation and the investigation was "fake news". "Sad!" A Washington Post review of recent special counsel and special prosecutor investigations found they took an average of three years to conclude.
A source on Trump's legal team claimed the president was referring to a Washington Post story "from the other night" rather than confirming he is being investigated.
Rosenstein serves under Attorney General Jeff Sessions. "Nearly everyone agrees that the Director made serious mistakes; it is one of the few issues that unites people of diverse perspectives", Rosenstein said in his memo.
ABC News, citing unnamed sources, reported Friday that Rosenstein has privately acknowledged to colleagues that he may have to recuse himself.
"Mueller is now clearly the (tip) of the deep state spear aimed at destroying or at a minimum undermining and crippling the Trump presidency", Gingrich tweeted on Thursday.
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