Trump has purposely and methodically made his proposed Muslim ban — and suspicion of American Muslims — a centerpiece of his nativist pitch to voters, along with promises to bring back jobs from overseas and crack down on illegal immigration. Trump has seized on the issue again this month in the wake of the massacre at a gay nightclub in Orlando, reiterating his support for blocking Muslims from the country after seeming to soften on the idea. He also alleged that many American Muslims and mosques are knowingly protecting terrorists, that the United States should consider profiling Muslims and that President Obama may be in league with Islamist extremists.