At first glance, President Donald Trump seems more powerful than ever. His party controls both chambers of Congress, and he just asserted dominance over that party by ousting Indiana state senators who defied him on redistricting, as well as successfully primarying United States senators in Louisiana and Texas.But on closer examination, Trump has weakened himself with his revenge politics by alienating many Republicans currently in Congress. This all but closes the door on any chance of new legislation reaching his desk. Unless something drastically changes, Republicans are set to lose the House and possibly the Senate in elections this fall, setting the stage for gridlock and impeachment next year. All this makes Trump far less able to govern.Texas Republicans overwhelmingly chose Trump’s endorsed candidate, state Attorney General Ken Paxton, over Sen. John Cornyn (R-TX) in Tuesday’s primary runoff by a 64% to 36% margin. This came weeks after Rep. Julia Letlow (R-LA), who had Trump’s backing, defeated Sen. John Cassidy (R-LA) in their primary battle. Both Paxton and Letlow are likely to keep the Texas and Louisiana Senate seats in Republican hands this November, although Paxton’s odds are considerably weaker than Cornyn’s would have been. If they win, Trump would gain two strong new allies in the Senate. But even then, neither would be sworn in until January, meaning they would not be available to help Trump with the urgent business he must conduct before then with the current roster of Republican senators.