McConnell, 'I know Trump can be a handful, but he is the most dominant figure in the Republican Party.
The GOP leader's associates told the Post that he doesn't plan to speak to Trump ever again after their last conversation on December 14, nor does he have interest in continuing their feud.
"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 a statement released through his political action committee amid the fallout over the former president's second impeachment trial.
He then questioned McConnell's political instincts. "We don't have a snowball's chance in hell of taking back the majority without Donald Trump".
"I'm sorry what happened on January 6", Graham said even though he voted against convicting Trump for inciting the insurrection. "Mitch McConnell at its helm".
But at the conclusion of the trial, Mr McConnell penned a scathing op-ed in the Wall Street Journal, in which he excoriated Mr Trump's behaviour during and after the riots as "unconscionable" and suggested the former president could still be criminally liable for his actions.
Trump's attack was also racially-loaded as he alluded to McConnell's wife Elaine Chao's alleged family's links to China as a reason for the GOP leader doing "nothing" on Beijing's "tremendous economic and military threat".
In the statement, he resorted to insults about Mr McConnell's acumen and political abilities, and faulted him for the Republicans' loss of their Senate majority. Trump responded in agreement.
"The people who stormed this building believed they were acting on the wishes and instructions of their president".
He even noted that though Trump is now out of office, he remains subject to the country's criminal and civil laws.
But, after Trump spent months making baseless claims that election fraud cost him the November election against Democrat Joe Biden, McConnell said that overturning the vote because of objections from the losing side would see American democracy enter "a death spiral".
He also said McConnell "begged" for his endorsement in the senator's home state of Kentucky while running for re-election past year - and suggested he would work to defeat McConnell and his Republican allies, saying he planned to "back primary rivals who espouse Making America Great".
What Mr McConnell has not done, though, is openly declare political war on Mr Trump in the fashion that the former president did to him on Tuesday.
"Rush thought we won", the former United States president said before claiming that he had held victory in the election.