GREELEY, Colo. — Donald Trump says he has two theories for the National Football League's decline in television ratings: the presidential campaign and Colin Kaepernick.

“I don't know if you know — the NFL is way down in their ratings. And you know why? Two reasons,” the Republican presidential nominee said at a rally here Sunday. “Number one is this politics, they’re finding, is a much rougher game than football, and more exciting. And this, honestly, we've taken a lot of people away from the NFL. And the other reason is Kaepernick. Kaepernick.”

Trump took the stage here as the Denver Broncos were playing the San Diego Chargers. He told the crowd he was wondering what the game would mean for his audience size. Soon after, he was talking about the NFL's problems.

It wasn't the first time Trump has criticized Kaepernick, a San Francisco 49ers quarterback who has decided not to stand during the national anthem to protest police shootings of minorities and other matters he considers systemic problems nationwide.

“Maybe he should find a country that works better for him. Let him try. It won’t happen,” Trump told conservative show host Dori Monson on KIRO Radio in Seattle in August.

Earlier this month, the NFL's ratings were down about 11 percent from last season.