Former President Donald Trump criticized the decisions of several Republican representatives to retire from the House of Representatives, further diminishing the GOP’s already slim majority in the chamber, RadarOnline.com has learned. In a Sunday post on Truth Social, the former president focused his rage at Rep. Mike Gallagher (R-WI), who announced that he will not reconsider his decision to leave Congress despite House Speaker Mike Johnson (R-LA) reportedly pleading for him to stay. “Never forget our cowards and weaklings!” Trump wrote in the post that was shared to his 6.8 million followers…