Former Maryland Gov. Martin O’Malley slammed Donald TrumpDonald John TrumpIvanka Trump, Jared Kusher's lawyer threatens to sue Lincoln Project over Times Square billboards Facebook, Twitter CEOs to testify before Senate Judiciary Committee on Nov. 17 Sanders hits back at Trump's attack on 'socialized medicine' MORE as a “carnival barker” Saturday at the second Democratic presidential debate as he bashed the GOP front-runner candidate’s immigration rhetoric.

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“The fact of the matter is, let's say it in our debate because you’ll never hear this from that immigrant-bashing carnival-barker Donald Trump, the truth of the matter is, net immigration from Mexico last year was zero,” O’Malley said.

“If we want wages to go up, we have to get 11 million of our neighbors out of the off-the-books shadow economy and into the full light of the American economy.”

O'Malley, who sits miles behind competitors Hillary ClintonHillary Diane Rodham ClintonBon Jovi to campaign with Biden in Pennsylvania The Hill's Campaign Report: 2020 spending wars | Biden looks to clean up oil comments | Debate ratings are in Biden gets late boost with key union endorsement MORE and Bernie SandersBernie SandersSanders hits back at Trump's attack on 'socialized medicine' Trump's debate performance was too little, too late Final debate: War Admiral vs. Seabiscuit MORE in current polling, balked at the prospect that Democrats need to compromise with Republicans on privileging border security before immigration reform.

“If more and more deportations were going to bring our Republican brothers and sisters to the table, it would have happened a long time ago,” he said.

“We must protect our borders, but there is no substitute for comprehensive immigration reform with a pathway to citizenship.”

The comments on Trump drew a quick counterattack from the GOP presidential frontrunner on Twitter.

O’Malley has repeatedly sought to use immigration as a wedge issue between him and the rest of the field. He bashed Clinton, the former secretary of State, and Sanders, the Vermont senator, as representing “the failed thinking of the past when it comes to our immigration policies” during an immigration candidate forum earlier this month.