With four hats, including national security adviser, the former Trump rival is defying predictions he’d be a weak player. Marco Rubio is doing big things under President Donald Trump — way more than nearly anyone expected. The secretary of State was once thought of as one of the weakest players in the Trump orbit, a man who wouldn’t last long in the Cabinet because he faced many internal rivals and had major policy differences with Trump and the MAGA base. But Rubio has deftly earned the president’s trust, enough so that Trump this week gave him another powerful job as...