Acting FBI director, top intelligence officials testify after Comey's firing

As Democrats demand an investigation into the president's firing of FBI Director James Comey, US media reported on Wednesday that, days before his dismissal, the US's top detective had requested additional funds to investigate Russia's possible meddling in the 2016 election - and any possible links to Donald Trump's campaign.

Trump, in his letter to Comey, thanked Comey for telling him three times "that I am not under investigation".

Grassley specifically rejected those calls, however, saying that a special prosecutor would mean the public doesn't get any information on the investigation unless that person brings a case.

"But that's not really the entire question here", Fishman continued.

The abrupt firing of Comey threw into question the future of the FBI's investigation into the Trump campaign's possible connections to Russian Federation and immediately raised suspicions of an underhanded effort to stymie a probe that has shadowed the administration from the outset.

Despite the Trump administration claims that his dismissal was months in consideration, Press Secretary Sean Spicer always said Comey had the president's full confidence.

He added: "I'm not going to spend time on the decision or the way it was executed". The FBI had also recently issued subpoenas to force associates of Trump's former national security adviser Michael Flynn to testify before a grand jury.

The letter marked Mr Comey's first known comments on his firing at the hands of Mr Trump, which sent shockwaves across the country over the timing and perceived breach of due process and natural justice.

Trump also took to Twitter saying: "James Comey will be replaced by someone who will do a far better job, bringing back the spirit and prestige of the Federal Bureau of Investigation".

Senate Intelligence Committee Chairman Richard Burr told reporters he did not feel an independent inquiry was necessary.

Other factors in this decision, apart their obvious personality clash, include the FBI investigation into alleged Russian interference in the USA election, as well as Comey's refusal to furnish Trump's team with a copy of his planned testimony to a Senate panel last week.

A few hours after news of Comey's firing broke, top Trump representatives, including White House counselor Kellyanne Conway and deputy press secretary Sarah Huckabee Sanders, appeared on television defending the president's decision and reflecting his frustration with the Russian Federation investigation. But the FBI's refusal to hand over the documents implies that it believes Trump's call on Russian Federation to hack Hillary Clinton's emails was at least relevant to their ongoing inquiries. The FBI has not confirmed that Comey ever made those assurances to the president. Some Republicans have said that could undermine concurrent investigations under way in the US Senate and House of Representatives.

The president's firing of FBI Director James Comey on Tuesday has led Democrats and others to raise concerns about the future of the investigation.

Colbert said he is "pretty confident" in his reasoning.

The White House says Rosenstein wrote his letter of his own accord, and that it triggered Trump's decision.

Justice Department leaders have interviewed four veteran law enforcement and intelligence officials for the role of interim director.

The White House has provided multiple reasons for Comey's firing since Tuesday.

It would be highly unusual for someone who might be the focus of an FBI probe to ask whether he was under investigation and to be directly told by the FBI director that he was not.