From BBC:
A storm is brewing - Anthony Zurcher, BBC News, Washington
A person doesn't rise as high as James Comey did in the federal government without learning how to cover his, er, posterior.
With this latest bombshell from the New York Times it's clear that the former FBI director, who was unceremoniously sacked by the president, is poised to enjoy the last laugh.
At the moment the White House is denying Mr Comey's reported characterisation of the conversation the two men had shortly after the president fired Michael Flynn.
In a he-said, he-said situation, however, the man who wrote contemporaneous memos - and that is memos, plural - will have the upper hand.
Add in that Mr Comey has a reputation for independence, and the face-off looks even more ominous for the president.
As deputy attorney general Mr Comey stood up to the Bush administration during a showdown over the legality of government surveillance programme. He also withstood withering criticism from Democrats over his handling of the Hillary Clinton email server investigation last year.
If he swears to a congressional committee that the president put undue pressure on him to end an ongoing Flynn investigation, his word will pack a punch.
The White House better batten down the hatches. A storm is brewing.