As the host turned a civil war at Fox to his advantage, he found himself at the forefront of the nativist forces transforming conservative politics.
A string of setbacks made the pundit flee television, the Republican establishment and even his home. He re-emerged with what may be the most racist, and successful, show in the history of cable news.
Some of President Trump’s supporters viewed his appearance in an S.U.V. to greet supporters as a sign that he was overcoming his illness.