By David Morgan WASHINGTON (Reuters) -A handful of hardline U.S. Republicans on Tuesday vowed to block Kevin McCarthy’s bid to become the speaker of the House of Representatives, signaling a brutal battle inside the party on its first day holding the majority. Republicans won a narrow 222-212 majority in November’s election, meaning that McCarthy — or any candidate for speaker — will need to unify a fractious caucus to win the gavel. Hardliners including Representatives Scott Perry, Andy Biggs and Lauren Boebert, oppose him, concerned that McCarthy is less deeply vested in the culture wars a…