It's pretty simple: his political life depends on winning the state.
“There is no way he wins reelection without it,” said Michael Steel, who advised former Florida governor Jeb Bush’s 2016 presidential campaign. “The question is whether he can expand beyond his base and reach out to groups like the Puerto Rican community, which was vital for Senator Scott.”
One of many worries for Trump:
"Florida’s population of nonwhite young adults continues to surge and outpaces the growth of older white residents. The trends create even more uncertainty in a state already known for close elections, especially in fast-growing areas."
Getting them to vote is another matter of course, but States of Change data indicate that Florida Hispanic 18-29 year olds in 2016 were +44 for Clinton--far, far, more Democratic than other age groups of Florida Hispanics. And even white 18-29 year olds were +5 for Clinton which, trust me on this, was dramatically better than older whites, particularly those over 45.
It'll be a close one. But remember: he probably can't win without it, so he's playing defense. Time to go on offense.