Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE's former campaign manager, Jeff Weaver, says Democrats shouldn't underestimate Republican presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE.

"But it’s going to be much closer than many people think,” Weaver continued.

“I think some people on the Democratic side who think that, you know, Trump is such a buffoon that it’s already won — but I think he’s a very dangerous opponent and I think he certainly has the ability to win as well," he said.

Trump received a bounce in polling following the Republican National Convention last month, eliminating polling leads for Clinton.