Donald Trump is facing increasing trouble trying to appeal to the GOP establishment. On Monday, 50 senior national security officials in the GOP signed a letter saying that Trump would “risk our country’s national security and well-being.” The letter continued: “He weakens U.S. moral authority as the leader of the free world. He appears to lack basic knowledge about and belief in the U.S. Constitution, U.S. laws, and U.S. institutions, including religious tolerance, freedom of the press, and an independent judiciary.”