WHITE PLAINS, N.Y. — Democrat Hillary Clinton is heading to the battleground state of Florida on Tuesday for an appearance with Al Gore, her party’s 2000 presidential nominee, to highlight an issue he has long championed and that is high on the list of concerns of millennials: combating climate change.

Clinton’s campaign argues that the issue offers a stark contrast with embattled Republican nominee Donald Trump, who has downplayed the phenomenon, once calling climate change a hoax perpetrated by the Chinese.

During the afternoon event in Miami, an aide said, Clinton plans to tout her plans to expand use of renewable energy, reduce oil consumption and invest in infrastructure that can withstand extreme weather. She will also tout the Paris Climate Agreement, for which she  helped lay the groundwork as secretary of state — a deal that Trump has said he would cancel.

The event is part of an effort by Clinton to continue a focus on policy issues in a race that has become dominated by the fallout over a 2005 video on which Trump was captured talking about women in extremely lewd terms, leading to a historic internal crisis among Republicans about his candidacy.

Gore, who served as vice president under Bill Clinton, remained on the sidelines during the Democratic primary season, declining to endorse either Hillary Clinton or Sen. Bernie Sanders of Vermont, who made climate change a key issue in his campaign.

Florida, of course, is a poignant choice of venue for Gore. It was the state whose aborted recount in 2000 led to his loss of the presidency to George W. Bush.

It has been 10 years since the debut of “An Inconvenient Truth,” an Academy Award-winning 2006 documentary that traced Gore’s efforts to educate citizens of the dangers of global warming.

Gore won a Nobel Peace Prize in 2007 for his efforts to make the issue part of the political agenda. And he remains active on this front, heading the Climate Reality Project, a global advocacy group.

Climate change is of particular interest both to Florida, which is now recovering from Hurricane Matthew, and to millennials, a key voting bloc with which Clinton has struggled to connect. In polls, young voters rate climate change much higher among their concerns than their older counterparts.

Clinton enjoys a large lead over Trump among millennials, but an unusually large number of voters under 30 have been considering third-party candidates. During the primaries, they gravitated toward Sanders.

An aide said Clinton will highlight the stakes for Florida of climate change, citing rising temperatures, rising sea levels and the risks for additional property damage and lost tourism revenue.

Ahead of her trip on Tuesday, Clinton called into WMBM 1490 AM, a Miami radio station that caters to an African American audience, an urged listeners not to take take the election for granted, despite Trump's current troubles.

"Florida is key," Clinton said. "If we win in Florida, there's no way my opponent can win. ... Despite all the terrible things he's said and done, he's still trying to win this election."