Trump launches assault in Florida in last-ditch attempt to win swing state

US presidential candidate Donald Trump has defiantly launched a campaign blitz in the key battleground state of Florida, hoping to prove wrong several national polls which hand a significant lead to his opponent Hillary Clinton.

It is likely that the Republican will have to win Florida's 29 electoral college votes if he wants to claim an unexpected victory in the 8 November election.

After flying into Collier County Fairgrounds on Sunday, Trump gave a rousing speech to fire up his supporters with just over two weeks to go until election day.

He raised a familiar topic during the speech, promising to secure the US' borders and launch an attack on radical terrorists.

"If I'm elected president, I'm going to keep radical Islamic terrorists the hell out of our country," he promised.

He maintained his stance on the alleged corruption of the media, who he has repeatedly accused of working in collusion with the campaign of his rival Clinton.

"Without the media, she doesn't doesn't have a chance," he added. "The best evidence that the system is rigged, is that Hillary Clinton is even allowed to run for the presidency of United States in the first place. She shouldn't be allowed to run."

The first national poll conducted since the last debate between Clinton and Trump shows the former with a 12-point lead, suggesting the gap between the two is widening.