The Twitter messages and Coast Guard Academy remarks were in stark contrast to the statement issued by Trump after the Wednesday night appointment of former FBI Director Robert Mueller as special counsel to investigate alleged Russian meddling in the USA presidential election and other matters.
"As I have stated many times, a thorough investigation will confirm what we already know - there was no collusion between my campaign and any foreign entity", he said in a statement.
- Donald J. Trump (@realDonaldTrump) May 18, 2017With all of the illegal acts that took place in the Clinton campaign & Obama Administration, there was never a special councel appointed!
Trump could make his first remarks on the special counsel appointment later Thursday when he meets with the Colombian president at the White House.
In fiery comments delivered in a speech in CT that recalled the rhetoric of his presidential campaign, Mr Trump said: "You can't let them get you down".
"This is the single greatest witch hunt of a politician in American history!"
Flynn's contacts with Russians during the presidential campaign, as well as his work for the Turkish government, are under investigation.
A senior administration official told Fox News that Trump was measured in his response to news of Mueller's appointment on Wednesday, telling his staff it was time to move forward.
In a written statement, Mr Trump insisted again that there were no nefarious ties between his presidential election campaign and Russian Federation.More news: Hassan Rouhani wins second term as Iran president
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The president is right about the rarity of a special counsel, although his references to the Clinton campaign and Obama administration may not bolster his case.
Democrats have clamored for Deputy Attorney General Rod Rosenstein to appoint a special counsel in the wake of reports that Comey penned a memo documenting a request from Trump that he "let go" of the investigation into former national security adviser Michael Flynn. He was sacked in February for misleading Vice President Pence and others over whether he discussed U.S. sanctions with Russia's ambassador to the U.S., Sergey Kislyak.
Rosenstein was due to brief USA senators later on Thursday. Democratic Senator Joe Manchin said Rosenstein would be questioned about a letter he wrote accusing Comey of missteps as Federal Bureau of Investigation director, including his handling of an election-year probe into Clinton's use of a private email server while she was secretary of state.
"I believe that's why we're having this investigation - to find out if in fact there was collusion".
Moments before Trump weighed in on Twitter, Democratic Senator Joe Manchin welcomed the special counsel investigation and said it was important to get facts in the Russian Federation probe. "I am on a fact-finding mission", he said on CNN.
Mr Ryan said that there were "some people out there who want to harm the president", also suggesting that Mr Comey had questions to answer about his failure to inform authorities sooner about his concerns.
Durbin said Trump's actions - including the decision to fire Comey and his "incessant" provocative posts on Twitter - have done more harm than any enemy, real or perceived, could.
Hours after issuing a more muted official statement in coordination with aides, the President took to Twitter to portray himself as unfairly victimized by the probe.