Washington (CNN) Republican front-runner Donald Trump gave some backhanded praise to his primary opponent, Jeb Bush, for traveling to the border, criticizing his past remarks on immigration and for being "low energy."

"I think it's great he's going to the border, I think he'll ... find out it's not an act of love," Trump told "Fox and Friends" on Monday morning. "I was down on the border. It's rough, tough, stuff. This is not love, it's other things going on."

Bush, who's in McAllen, Texas, on Monday for a tour of the border, has previously made comments in regards to illegal immigration where he called it a "different kind of crime" and an "act of love."

"Yes, they broke the law, but it's not a felony. It's an act of love, it's an act of commitment to your family," Bush told Fox News host Shannon Bream at an event last year.

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