Republican presidential candidate Donald Trump arrives on stage during a campaign rally at the Million Air Orlando, which is at Orlando Sanford International Airport on Oct. 25, 2016 in Sanford, Florida. Photo by Joe Raedle/Getty Images

If you believe Republican presidential nominee Donald Trump, he is the one and only person capable of beating his Democratic opponent in the 2016 election, Hillary Clinton. In fact, Trump warned Tuesday that if Clinton wins the presidency, she's pretty much guaranteed two terms because another Republican won't have a chance of winning in 2020.

"This is the last time we're gonna have a chance," Trump said to a crowd at a rally in Sanford, Florida. "Four years it's over. It's over. In four years, you don't have a chance."

Trump's remarks were seemingly a direct shot at GOP politicians perhaps eyeing a run in 2020, including Florida Sen. Marco Rubio and Texas Sen. Ted Cruz, both of whom Trump overcame on the way to the earning the Republican nomination this year.

"All these characters, they wanna run in four years," Trump said. "They can forget it. They're wasting their time. You don't have even a little bit of a chance. This is it, and we're really close."

While Trump dismissed Tuesday potential 2020 candidates, he also seemingly tried to court Republicans to come home to his campaign after controversies — chiefly a video of him bragging about sexual assault in 2005 — pushed them away.

"Republicans have to finally get smart and come together. This is our last chance," he said. "This is bigger than me or any of us. It's about our country. This is about ending Obamacare. This is about the Supreme Court. This is about rebuilding our military and taking care of our vets, strengthening our borders and keeping our companies and jobs from leaving our beloved country. This is about restoring the rule of law, saving our Constitution and keeping radical Islamic terrorists the hell out of our country."

Trump trails in the polls behind Clinton, down 4.7 percentage points nationally in a four-way race that includes Libertarian nominee Gary Johnson and Green Party nominee Jill Stein, according to the Real Clear Politics average of polls. The speech Tuesday was part of a three-day blitz on Florida from Trump, who likely needs to win the Sunshine State's 29 electoral votes if he want to build a realistic path to the 270 electoral votes needed to win the White House. While polling shows a tight race in Florida, Trump said he will win the state and targeted the "dishonest" media for seemingly not confirming his projection.

"We're gonna win Florida," Trump said after claiming Clinton would beat other GOP politicians in 2020. "By the way. No, no, these guys won't tell you that because they don't want to tell you that. But when they interview, when they, these are the most corrupt people, when they interview the people standing on the line and they say, 'Trump, Trump, Trump, Trump.' They say all right, let's get out of here this is bad. This is bad news. These are the most dishonest, almost as dishonest as crooked Hillary."