Trump said that Sen. Joe Manchin should have joined the GOP long ago.
Trump lashed out at McConnell in a post on Truth Social.
Trump wrote that McConnell had made a mistake and that Manchin was worried.
The senator from West Virginia is blocking legislation from being passed. He gutted President Joe Biden's spending plan.
The Inflation Reduction Act was moved through the Senate thanks to Manchin's help.
People ask why Joe Manchin went off the rails. "Mitch McConnell forced his hand by saying that Manchin was weak and ineffectual and that he, McConnell, had him under control," Trump wrote.
The former president said that "Manchin couldn't stand for that and turned strongly, not against the Republicans, but against McConnell."
Joe Manchin should have joined the Republican Party a long time ago.
The representatives for Manchin did not reply to the request.
The Democrats' liberal wing of the Senate Democrats and the Senate GOP objected to Manchin's push to make it easier to build fossil fuel projects in West Virginia.
Manchin spoke about the odd alliance of Democrats and Republicans at a press conference on Tuesday.
Manchin has been involved in state politics and federal politics. I've never seen a stranger bedfellow than the extreme liberal left siding with the Republicans.
I am hearing that this is revenge politics. He said it was revenge against one person.
McConnell didn't try to make nice with Manchin. McConnell invited Manchin to join the GOP after the Democrats called him a liar. McConnell said the party wanted to humiliate Manchin.
McConnell told the New York Times that they would love to have him on their team. He would be more comfortable.