One of the site's three models says Clinton would win if election were held today.
Clinton leads Trump by just 1 point, 43 to 42 percent.
A group of secretaries of state says current security measures are sufficient.
A majority of voters say they think Trump is racist.
Timothy Cama 09/26/16 10:16 AM EDT
Myron Ebell has often referred to warnings about global warming as climate "alarmism."
As many as 100 million are expected to tune in to Monday night's debate.
Clinton has prepared to debate a more subdued Trump.
NBC News's Lester Holt is moderating the debate at Hofstra University.
The candidates are within 1 point of each other.
Trump has feuded with Clinton's decision to bring Mark Cuban to Monday's debate.