Donald Trump. Jeff Swensen/Getty Images Donald Trump appears to be hedging his bets in Pennsylvania ahead the November election.

"The only way we can lose, in my opinion, I really mean this, Pennsylvania, is if cheating goes on,” Trump told attendees at a campaign rally in Altoona, Pennsylvania, on Friday.

"The only way they can beat it, in my opinion, and I mean this 100%, is if in certain sections of the state they cheat,” he added.

The Republican presidential nominee suggested that law-enforcement officials should get involved.

The Manhattan billionaire even encouraged his supporters to "watch and study" people "in certain areas" of the state on Election Day to "make sure people don't come in and vote five times."

"Because if you do that … we're not going to lose,” Trump said.

“I hope I win. I’m going to feel very, very foolish if I don’t win,” Trump told the crowd.

The campaign appeared to dig further into that call to action late Friday night. A sign-up form appeared on the GOP nominee's website prompting people to volunteer as "Trump election observers."

Here's a screenshot of the form:

Screenshot via Donald Trump

Users who fill out the form are directed to a donation page.

Poll numbers in Pennsylvania are not favoring him at the moment.

Clinton is leading Trump by as much as 11 points overall there, according to the four most recent polls in the state featured on RealClearPolitics this week.

Nationally, Clinton’s lead is smaller, with just over 6 points on Donald Trump, based on the average of several polls taken between August 1 and August 11.