Several officials, like Vice President JD Vance, have questioned the president's choices, particularly regarding the war in Iran.
In his statements, he also acknowledged that the rise in oil prices caused by the fighting with Iran had not helped the Republican camp's position.
On Wednesday, Mr. Trump appeared disconnected, preferring to dwell on his future ballroom at the White House, a project dear to him.
Tongues have loosened after the rout. Republican leaders did not remain groggy for very long.
The vice president, until now the presumed successor, quickly reacted in a long message on the social network X.
Donald Trump refuses to take responsibility for this setback. He declared:"Our elections are so rigged, you have no idea.".