It’s rare when lawyers — as opposed to their clients — take the Fifth Amendment. But Jeffrey Clark, the former Justice Department lawyer who reportedly tried to help Donald Trump overturn the 2020 presidential election, is now claiming the privilege against self-incrimination to avoid testifying before the House committee investigating the Jan. 6 attack on the Capitol. He has just been joined in that posture by one of Trump’s main outside legal advisers, John Eastman. Their fear of incrimination could well be justified: There can be serious state and federal criminal consequences for trying to fraudulently interfere with an election....