Chris Christie has released a new Web ad that skewers rival Marco RubioMarco Antonio RubioRyan pledges 'entitlement reform' in 2018 Richard Gere welcomes lawmakers' words of support for Tibet Dem lawmaker gives McConnell's tax reform op-ed a failing grade MORE by playing footage of an interview where Rick Santorum struggled to name Rubio’s accomplishments. 

Santorum dropped out of the Republican presidential race on Wednesday and endorsed Rubio, who placed third in the Iowa caucuses. But pressed during an interview on MSNBC's "Morning Joe" to name the Florida senator's accomplishments, Santorum could recall only one thing related to a fight over ObamaCare.

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Christie’s campaign pounced on the clip and edited it down to fit into a one-minute video that was sent out to reporters.

The ad “highlights yet again Marco Rubio’s total lack of experience,” said Samantha Smith, a Christie spokeswoman. She confirmed that it’s part of a digital buy but wouldn’t elaborate as to how much money the campaign has put behind it.

The video, titled “It’s a simple question,” only includes footage of Santorum’s interview. The ending, “I’m Chris Christie, and I approve this message,” is the only other footage used in the ad.

During a separate interview on Fox News, Santorum called Rubio "a tremendously gifted young man, and he's a leader, he's a born leader."

The Christie video is the latest example of candidates training their fire on Rubio as they battle for supremacy in New Hampshire, which could be a make-or-break state for many candidates. The state's primary will be held on Tuesday.

Christie is currently polling at sixth in New Hampshire, according to RealClearPolitics’s average of recent polling. He’s trailing Jeb Bush, John Kasich, Ted Cruz and Rubio, who are all bunched together within 6 percentage points. Donald Trump holds the far and away lead, 20 points higher than Rubio.

Rubio has drawn the ire of Bush, Kasich and Christie on the stump, as they all wrestle for similar constituencies. But the barbs have increased since Rubio’s strong third-place performance in Monday’s Iowa caucuses. 

Bush chided Rubio on the stump Thursday by questioning his accomplishments in the Senate, noting that while Rubio pointed Thursday to his role in passing sanctions on Hezbollah, he wasn't there to vote on the bill's passage. Rubio authored the bill, but did not attend the vote.