Donald Trump joined his pals on Fox and Friends this morning and discussed the upcoming presidential debate on Monday. He soon turned into a Health Truther and said, “We’ll see what’s going on with her because there’s something going on that a lot of people are trying to figure out."

That's one of Trump pet phrases. "A lot of people" say or "a lot of people" found this or that out or "many, many people" are investigating and found terrible things out about so and so.

You never get to know who these people are, but there are a lot of them, apparently.

Trump also said that he'll be respectful during the debate if she's nice to him. "I think she deserves that. I’m going to be nice. If she’s respectful of me that’ll be nice. We’ll have something I think people will respect as a debate.

.@realDonaldTrump on upcoming debate: "I'm going to be very respectful" of Hillary Clinton, "I think she deserves that" pic.twitter.com/qdpsMOoSdc

— FOX & Friends (@foxandfriends) September 22, 2016

Trump has had this weird thing where he always says if somebody is nice to him, he'll be nice back.

His mentality is like that of a pre-teen.

If Putin calls him "brilliant," then Putin is a fine fellow.

"You said, ‘I will tell you, in terms of leadership, he’s getting an A, our president is not doing so well. And when referring to a comment that Putin made about you, I think he called you a brilliant leader, you said, ‘It’s always a great honor to be so nicely complimented by a man so highly respected within his country and beyond,’ " Lauer said. "But do you want to be complimented by that former KBG officer?"

"Well, I think when he calls me brilliant, I’ll take the compliment, OK?" Trump said, "The fact is, look, it’s not going to get him anywhere. I’m a negotiator."

Has this man matured past the age of 12?