It is unclear whether word of the Comey request, put to deputy attorney general Rod Rosenstein, ever made its way to Mr Trump, but the news intensified pressure on the White House to explain the motives behind Mr Comey's removal.
In his letter, Mr Comey said he had long believed that a president could fire an Federal Bureau of Investigation director for any reason or for no reason at all.
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.
Trump had grown angry with the Russian Federation investigation - particularly Comey admitting in front of the Senate that the FBI was investigating his campaign - and that the FBI director wouldn't support his claims that President Barack Obama had tapped his phones in Trump Tower.
Based on his deputy's assessment, Attorney General Jeff Sessions made the recommendation that Comey be removed from his post, upon which Trump acted immediately.
In the letter, Mr Comey also said he would not dwell on the decision and hoped others would not either, despite the brutal method by which he was dispatched.
The Democratic opposition is united behind a key demand: for the Justice Department to appoint a so-called special counsel to oversee the investigation.
"If he wanted to fire him, it would seem appropriate to fire him at the beginning of his presidency", said Meeks (D-Queens), whose district includes parts of Nassau County. As to Trump's contention that the firing had to do with Comey's decision-making on such matters as the Clinton emails, he said, "Nobody believes that."Trump, in his letter, pointedly thanked Comey for telling him three times "that I am not under investigation".
Prince Philip jokes about advanced years
However a well-placed source said there was no cause for concern about the health of the queen or Philip, who turns 96 in June. Like her husband, Queen Elizabeth has gradually cut back her workload in recent years as they go into their nineties.
The ranking Judiciary Committee member on Tuesday issued a milquetoast statement after the news.
Schumer also asked that Sessions and his deputy appear before the Senate to answer questions about the circumstances surrounding Trump's decision to fire Comey. It came as such a shock to the director as he discovered he was out of a job via breaking reports on TV news when speaking to personnel at the FBI's Los Angeles office. Comey", he tweeted. "Now that he has been fired they PRETEND to be aggrieved.
We learned Wednesday that Comey had recently asked for more resources in investigating whether Russian Federation had a role in Trump's campaign.
The Senate intelligence committee on Wednesday subpoenaed former Trump national security adviser Michael Flynn for documents related to its investigation into Russia's election meddling. 'I don't - we can follow - I can try, yeah, ' he said. During that testimony, Comey also said that it made him "mildly nauseous" knowing that his handling of the Hillary Clinton email probe a year ago may have had an impact on the USA presidential election.
Naeem Aslam of financial service provider Think Markets claimed the firing of Mr Comey could harm President Trump's legislative power, causing a gridlock on both tax reforms and finishing the task of repealing and replacing Obamacare.
Outraged Democrats called for an independent investigation into the Trump campaign's possible ties to Russia's election interference, and were backed by a handful of prominent Republican senators. That didn't happen. And they surely calculated that the reaction from Republicans would be one of modulation if not quiet approbation.
"Compounding the error, the director ignored another longstanding principle: we do not hold press conferences to release derogatory information about the subject of a declined criminal investigation".
Prior to this, Mr Comey had shown a "lot of missteps and mistakes" over the previous year.