Clinton surrogate bashes Sanders for 'newfound advocacy' on immigration reform

Rep. Xavier BecerraXavier BecerraBecerra: California ready to fight Trump administration House Dems to perform election autopsy Sanders vs. Trump: The battle of the bully pulpit MORE (D-Calif.), a surrogate for Hillary ClintonHillary Rodham ClintonFeinstein after dinner with Clinton: She has 'accepted' her loss Sanders: Trump is 'a pathological liar' Clintons remember John Glenn as a 'uniquely American hero' MORE, is bashing her rival Bernie SandersBernie SandersSanders: Trump is 'a pathological liar' Pressure grows on Perez to enter DNC race Senate sends annual defense bill to Obama's desk MORE for his "newfound advocacy" on immigration reform, calling on the Vermont senator to "explain his spotty record [and] how he'll get it done."

Becerra tweeted Wednesday morning that Sanders has been advocating for support of immigrant families recently but called into question his record.

"We've been hearing a lot from @BernieSanders about supporting immigrant families of late. Where was he before he ran for president?" Becerra asked in one tweet.

He called Sanders out for voting against the late Sen. Ted Kennedy's (D-Mass.) comprehensive immigration reform bill in 2007. He also said Sanders voted for a measure designed to protect Minutemen, anti-immigrant militias on the U.S.-Mexico border.

The chairman of the House Democratic Caucus called on Sanders to be honest about his record, saying fixing the country's immigration system is "tough, serious biz" and that "high-flying talk [without] a track record of action deceives those who need us most."

Last weekend, Sanders vowed to use executive action on immigration if he is elected president. He said at a rally in Nevada that if Congress does not address the problem, "We will use the executive powers of the White House."