"Folks, we're winning. We're winning. We're winning," he declared in St. Augustine, Florida.
And earlier Trump declared on Twitter, "We are winning and the press is refusing to report it."
But in an interview on WBT radio Monday, Trump said, "I guess I'm somewhat behind in the polls but not by much."
The day before, Trump campaign manager Kellyanne Conway appeared on NBC's "Meet the Press" and said, "We are behind."
And Monday she tweeted:
"Our advantage is that Donald Trump is just going to continue to take the case directly to the people," Conway said.
"We have a shot of getting those undecided voters," she said. "We need to bring them aboard over the next couple of weeks."
Republican National Committee communications director Sean Spicer agreed with Conway, saying on CNN's "Reliable Sources" later on Sunday, "There's no question — I think we're trailing behind."
He added, "But I think we've got the wind at our back heading into the final two weeks."
Clinton vaulted to a double-digit advantage in Sunday's inaugural ABC News 2016 election tracking poll. The poll showed Clinton leading Trump by 12 percentage points among likely voters, 50 to 38 percent, in the national survey — her highest support and his lowest to date in ABC News and ABC News/Washington Post polls.
Trump held a roundtable this morning with farmers in Boynton Beach, Florida, deeming the ABC News poll "phony" and telling the voters, "I actually think we're winning."
"We're up in Ohio. We're up in Iowa. We're doing great in North Carolina. I think we're doing great in Florida," he said. "I think we're going to win Florida big."
He said "phony polls" are "part of the crooked" and "rigged system that I've been talking about since I entered the race."