Donald Trump phoned Mitch McConnell in a fit of rage after he congratulated US President-elect Joe Biden on December 15, 2020, according to a new book.
It's reportedly the last time the two men spoke and it was very unpleasant, according to an account in Peril by Bob Woodward and Robert Costa.
Trump is said to have "spewed expletives" at the then Senate Majority Leader during the call, calling him "disloyal and weak", according to a Business Insider report on the book.
At the time, Trump was trying to overturn the election results and was overtly unhappy his allies refused to embrace his falsehoods about his loss to Biden.
McConnell's last remark in the conversation is said to have been: "You lost the election, the Electoral College has spoken."
The 79-year-old Republican Senator representing Kentucky hopes it is the last time he ever speaks to Trump, according to Woodward and Costa.
However, McConnell has a long history of aiding and abetting the former reality TV star during his single term as US President.
His loyal support for Trump appears to have mostly ended on January 6 during the insurrectionist attack on the US Capitol that killed five people, injured a further 138 police officers and cost around US$30 million in repairs and resulting security measures.
"Trump is practically and morally responsible for provoking the events of the day," McConnell said in February.
"The people that stormed this building believed they were acting on the wishes and instructions of their president."
However, he voted to acquit Trump when he was impeached over the insurrection, just as he had a year earlier when Trump was impeached for abuse of power and obstruction of Congress.
Since then, it's not known if Trump and McConnell have spoken to one another - but they have spoken about each other.
"Mitch is a dour, sullen, and unsmiling political hack, and if Republican Senators are going to stay with him, they will not win again," Trump said in another statement.
Peril, which is released on September 21, is the third book on Trump written by Woodward, following Fear and Rage.
It is described by The Guardian as "meticulously researched" and "a curated narrative of events and people [that] comes with a point of view".