President Donald Trump heads to Capitol Hill Tuesday evening to rally House Republicans behind an immigration bill he panned just five days ago. Now Republicans have to decide: Which Trump do they believe? Speaker Paul Ryan and his top lieutenants are well aware that only the president can give conservatives cover to vote for a bill that includes a pathway to citizenship for Dreamers — a huge leap for those who once dismissed that idea as “amnesty.” It’s why leadership invited Trump for a rare meeting with the entire Republican conference, just days after he indicated he might veto the...