House Speaker Paul D. Ryan finds himself in the middle of yet another Republican civil war as the battle over LGBT rights has come to Congress, threatening to divide an already fractured GOP. It is a fight the speaker does not want to have — especially in a competitive election year in which presumptive GOP presidential nominee Donald Trump’s candidacy is already tearing the party apart. The fight escalated on Thursday when shortly before an expected vote over an energy and water spending bill, House Republicans held a private meeting in which many vented their frustrations over language passed late Wednesday to bar discrimination against lesbian, gay, bisexual and transgender employees of federal contractors, according to several people in the room.