(CNN) Donald Trump has built a political brand on his willingness to say just about anything that comes to mind at a given moment -- relying, he says, on his "gut." Sometimes that means contradicting himself on fairly basic ideas and sentiments, like as recently as Tuesday about whether or not crying babies are fun to be around (Hint: less so over time).

The Republican nominee has no monopoly on broader policy reversals -- though he has certainlyadjusted his positions as much as anyone -- but it is his remarkable agility to pivot in really tight spaces that continues to stun and frustrate opponents.

Here are a few things Trump has changed his mind about since becoming a presidential contender.

Hillary and Bill Clinton

"I know her very well and I know her husband very well and I like them both. And they are, uh, you know, just really terrific people." -August 2013

But then...

On Hillary: "She's the devil." -August 1, 2016

On Bill: "[He] is one of the great abusers of the world." -Dec. 30, 2015

The entertainment value of NFL football

"I don't know what it is, but I'm getting totally bored watching NFL football. Too many penalties and far too soft! T.V. off and back to work." -Oct. 5, 2014.

But then...

"As usual, Hillary & the Dems are trying to rig the debates so 2 are up against major NFL games. Same as last time w/ Bernie. Unacceptable!" -July 29, 2016

His 'relationship' with Russian President Vladimir Putin

"I do have a relationship ... He's probably very interested in what you and I am saying today, and I'm sure he's going to be seeing it in some form. But I do have a relationship with him." -Nov. 2013

But then...

"I have no relationship with Putin. I don't think I've ever met him. I never met him." -July 2016

His role ahead of the Republican National Convention

"It's very important to put some showbiz into a convention, otherwise people are going to fall asleep" - April 17, 2016

But then...

"I didn't produce our show -- I just showed up for the final speech on Thursday." -After the RNC

The utility of debt and whether he has any

"I'm the king of debt. I love debt." -May 4, 2016

But then...

"I have very little debt to anybody. I don't need debt." -July 31, 2016

Mitt Romney

"I have gotten to know him and he's a terrific guy. I don't know if he really comes out like he really is in person. He's a warm, smart, tough cookie and that's what this country needs. We need somebody that's tough, that will stop China and OPEC and all these other nations from just ripping us up. And I think he can do it." -Feb. 2012

But then...

"Mitt Romney had his chance to beat a failed president but he choked like a dog." -Jun 11, 2016

Whether presidential nominees should release their tax returns:

On Romney's returns: "I think in light of the fact that he started discussing some of the things, namely the rate or approximately the rate, I think it probably be better off just to release them now." -Jan. 2012

But then...

On his own returns which he has refused to make public: "There's nothing to learn from them." -May 2016

Bill de Blasio's fitness to be mayor of New York City

"I think he is going to want to make New York great. ... I think pretty strongly that he'll end up being a good mayor, maybe a very good mayor." -Oct. 2013

But then...

"N.Y.C. has the worst Mayor in the United States. I hate watching what is happening with the dirty streets, the homeless and crime! Disgrace." -Dec. 7, 2015

This crying baby

"Don't worry about that baby, I love babies. I love babies! I hear that baby crying, I like it. I like it! What a baby. What a beautiful baby. Don't worry, don't worry. The mom's running around like -- don't worry about it. Its young and beautiful and healthy. That's what we want." -Aug. 2, 2016

But then...

"Actually, I was only kidding, you can get the baby out of here. That's alright. Don't worry. I think she really believed me that I love having a baby crying while I'm speaking." -Less than two minutes later, on Aug. 2, 2016.