The Democratic presidential candidate's campaign says the hip-hop artist will perform on Nov. 4. Even as his path to the presidency narrows, a defiant Donald Trump is insisting he is "winning" and urging his supporters to defy what he is calling an establishment conspiracy to deny the White House to his populist movement. Trump, in the middle of a three-day swing through battleground Florida as thousands began voting there in person, hammered the "disgusting" media on Monday for its "phony polls" that he claimed were the latest signs of a "rigged election." [...] even as Trump publicly displayed his trademark bravado, his team conceded publicly as well as privately that he was trailing — and that crucial Pennsylvania may be slipping away to Democrat Hillary Clinton.