PALM BEACH, Fla. (AP) — Former President Donald Trump is preparing to launch his third campaign for the White House on Tuesday, looking to move on from disappointing midterm defeats and defy history amid signs that his grip on the Republican Party is waning.

Trump had hoped to use the GOP’s expected gains in last week’s elections as a springboard to vault himself to his party’s nomination. Instead, he finds himself being blamed for backing a series of losing candidates after Republicans failed to take control of the Senate. While the party was on the cusp of retaking control of the House on Tuesday, it could end up with its narrowest majority in decades.

“Hopefully, tomorrow will turn out to be one of the most important days in the history of our Country!” Trump wrote on his social media network on Monday. An announcement was expected at 9 p.m. EST Tuesday from his club in Palm Beach.