U.S. Supreme Court Justice Samuel Alito has signaled that he’s ready to retire, but only if there’s a Republican in office, according to a new report. The 74-year-old Alito missed two days at the end of the last term amid growing tensions with his colleagues, and increasing public scrutiny concerning partisan bias and questionable ethics has him privately considering stepping down from the bench, according to a new report from CNN Supreme Court analyst Joan Biskupic. “While Alito is still relatively young as far as justices go (most in recent years haven’t left the bench until their 80s), he h…