Grassley defends GOP incumbents as Trump wades into primary fights 

Sen. Chuck Grassley (R-Iowa) on Thursday defended several of his Senate GOP colleagues who are staring down potentially tricky reelection fights after President Trump indicated he will not support them this year. Trump over the weekend announced he will back Rep. Julia Letlow’s (R-La.) primary bid to unseat Sen. Bill Cassidy (R-La.), a move that…