Two of Trump’s top campaign aides previously worked for DeSantis. If they can deflate DeSantis and the field of rivals remains broad, Trump’s allies believe he can once again win the nomination simply because his longstanding grip on about 30% of Republican voters. DeSantis allies argue the governor’s youth — he’s 44 — and his focus on his accomplishments and his resume will help him withstand the scrutiny of Trump’s opposition researchers and insults from the candidate himself. “You don’t have to define President Trump. I don’t think Ron DeSantis saying anything negative about Donald Trump will change anyone’s mind,” said Mick Mulvaney, Trump’s former White House chief of staff.