Donald Trump kicks off his re-election campaign in Florida

The United States president, Donald Trump formally launched his bid for a second term at a rally in Orlando, Florida.

His campaign fired several pollsters yesterday after a leak of unflattering poll numbers.

"He can't win the White House without Florida, and we're going to step up big time to make sure he gets it," Joe Gruters, chairman of the state Republican Party, said.

Starting Friday, the Trump campaign and allies have been hosting a "National Week of Training" across the country for 16,325 attendees at more than 970 events, including, "Trump Victory Leadership Initiative" training sessions and "MAGA Meet-Ups," according to numbers provided to ABC News by the campaign.

Trump flipped Florida red in 2016 with just 1.2% more votes than Democratic nominee Hillary Clinton. It was the first time the state voted Republican since President George W. Bush won it during his reelection in 2004.