Story highlights

Jeb Bush's campaign released an online video taking aim at Donald Trump on Monday

Trump has called Bush "low energy" on the campaign trail

Washington CNN  — 

Republican presidential candidate Jeb Bush pressed on with his offensive against Donald Trump Monday, posting a video slamming the GOP front-runner’s immigration plan as “catastrophic.”

The one-minute video includes news reports and conservative columnist Charles Krauthammer slamming Trump’s plan to deport the estimated 11 million undocumented immigrants living in the U.S.

The video highlights a July 19 Wall Street Journal editorial that slammed Trump’s candidacy as a “catastrophe.”

It also references Trump’s past criticism of 2012 GOP nominee Mitt Romney’s self-deportation policy as “maniacal,” while himself calling for a mass deportation policy.

“If thats the position that is now the center of Republican debate, it’s catastrophic,” Krauthammer says in a clip included in the video. “If (Romney’s plan) that’s maniacal and mean-spirited, forced mass deportation is much worse.”

The video comes as the Bush campaign shifts gears to attack Trump more directly.

It also came hours after Trump posted a video on his Instagram account drawing on a 2013 clip of Bush’s mother, former First Lady Barbara Bush, saying, “We’ve had enough Bushes.”

Bush has been more vocal lately, insisting that Trump is not a true conservative while touting his own record implementing conservative policies as Florida’s governor.

Trump has responded with more attacks of his own, repeatedly calling Bush “low energy” on the campaign trail.

In a video posted online two weeks ago, Trump chimed in again with his trademark, “No more Bushes” in an Instagram mashup of former Presidents George H.W. and George W. Bush, father and brother to Jeb Bush.

Trump responded to the Bush campaign video, saying, “Even this video is boring.”

“He is doing so poorly in the polls that he is now starting to spend some of the money that his ‘bosses’ – special interests and lobbyists – have given him to attack me,” Trump said via a statement distributed by his spokeswoman. “The last thing this country needs is a low-energy president without any substance or any ideas on how to Make America Great Again.”