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Hillary Clinton (left) and Donald Trump (right) are running for president as a Democrat and Republican, respectively.

(File photos)

TRENTON -- Democratic presidential nominee Hillary Clinton and Republican opponent Donald Trump will finally face off Monday night in their first debate.

Experts say it's unclear exactly what to expect. Clinton is a veteran politician, having served as first lady, U.S. senator, and U.S. secretary of state. Trump is a celebrity businessman and former Atlantic City casino tycoon who has never run for office.

Plus, the two have spent the last few months attacking each other in speeches. Clinton says Trump's unpredictable behavior, his penchant for insults, and his business record disqualify him from the White House. Trump says Clinton's email scandal, questions about her foundation, and what he calls her lack of stamina disqualify her.

And polls, once dominated by Clinton, show a tighter race than many pundits expected.

Clinton has reportedly been preparing for two "Trumps" at the debate -- the usual, off-the-cuff controversial Donald and one who may try to appear presidential Monday.

Trump, meanwhile, has taken a different approach to debate prep, holding informal gatherings at his Bedminster golf course. He told Fox News on Thursday night that his time on the campaign trail has also been preparing him.

The debate -- the first of three between the candidates -- is scheduled for 9 p.m. Eastern time Monday at Hofstra University in Hempstead, Long Island.

The 90-minute event will be broadcast on C-SPAN, ABC, CBS, FOX and NBC, as well as all cable news networks CNN, Fox News, and MSNBC.

Who do you think will win: Clinton or Trump? Vote in the informal, unscientific poll below.

Brent Johnson may be reached at bjohnson@njadvancemedia.com. Follow him on Twitter @johnsb01. Find NJ.com Politics on Facebook.