Despite initially opposing appointment of an independent counsel, Republican House Speaker Paul Ryan said Thursday that the development "helps assure people and the Justice Department that they're going to go do their jobs independently and thoroughly, which is what we've called for all along".
The New York Times reported Tuesday that Comey had written a memo about the incident, in which Trump also urged the Federal Bureau of Investigation director to arrest journalists reporting on leaked material.
The White House didn't learn of his appointment by Deputy Attorney General Rod Rosenstein until 30 minutes before it was publicly announced.
Rosenstein objected to Comey's conduct in the investigation into Hillary Clinton's private server emails.
United States intelligence services have concluded that Russian hackers attempted to influence the Presidential election campaign to discredit Hillary Clinton and affect the result.
On July 5 previous year, Comey had announced the FBI's recommendation that the US Department of Justice should file no criminal charges relating to the Hillary Clinton email controversy. Comey in a press conference termed Secretary Clinton's and her top aides" behaviour "extremely careless', but concluded that "no reasonable prosecutor would bring such a case".
"This is the single greatest witch hunt of a politician in American history!" added Trump, who said in a speech on Wednesday that "no politician in history" had been treated worse or more unfairly than he has.
Sources claim that individuals connected with the Trump campaign may have been co-ordinating with the Russians as far back as April 2016, seven months before the Presidential election.
Michael T Flynn, who had campaigned for Trump in these elections, was under investigation for his financial ties with Russian Federation and Turkey.
FBI investigators reportedly discovered multiple contacts that are a cause for concern including Paul Manafort, former Trump Campaign Chairman, Carter Page, former Foreign Policy Advisor and Michael Flynn, the former National Security Advisor.
Trump tweeted that he has "the absolute right" to share certain information with Russia but also didn't specifically say whether he spilled highly classified information to Russian officials.
What was Comey up to?
The Senate intelligence committee on Wednesday asked Comey to appear before the panel in both open and closed sessions.
Republicans and Democrats alike were eager to hear from Comey, who has increasingly emerged as a central figure in the unfolding drama.
The Times reported that Comey wrote in a memo that Trump told him that "He is a good guy".
Trump himself hasn't directly addressed the latest allegations that he pressured Comey to drop the Flynn investigation. "The President must be impeached", Green said.
A Democratic lawmaker has called for impeachment of US President Donald Trump for his alleged involvement in obstruction of justice, after news reports revealed that he had asked the FBI to stop investigations against former national security advisor Michael Flynn.
The controversy has further weakened the Trump regime, which was earlier cheered by markets for its pledge to reform U.S. taxes and boost domestic businesses.
There have been whispers for days now of what it's like working for Trump, the billionaire New Yorker and insurgent candidate who took over the Oval Office without any political experience.
Back home, equity benchmarks Sensex and Nifty have slipped almost one per cent in morning trade on Thursday, while the rupee tanked by 90 paise in anticipation of a possible selloff by FIIs.