Rep. Ted Lieu (D-Calif.) predicted Thursday that "people would take to the streets" if President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE fired Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE as a precursor to ousting special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE.

In an interview on CNN, Lieu said that any attempt to fire Sessions would amount to obstruction of justice, and would likely signal that Trump is trying to get rid of Mueller, who's investigating possible collusion between the Trump campaign and Russia, among other issues.

"That would be obstruction of justice and the only reason he would be doing that is to try to meddle with special counsel Robert Mueller," Lieu said. "That would be an act that would be violating the rule of law. I think people would take to the streets and I urge the president not to do it."

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Trump has publicly and privately fumed about Mueller's investigation, which he has called a "witch hunt."

Mueller was appointed last year by Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, who began overseeing the Russia probe after Sessions recused himself from matters involving the Trump campaign.

Sessions's recusal angered Trump, who has repeatedly accused his attorney general of failing to protect him from potential legal scrutiny. He said in an interview with The New York Times last year that he would have picked somebody else for the top law enforcement job, if he had known that Sessions would step aside from the Russia investigation.

Mueller is also investigating whether Trump sought to obstruct the Russia probe by pressing former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE to drop his bureau's investigation into former national security adviser Michael Flynn and later firing Comey when he refused to do so.

Flynn, a Trump campaign aide, has pleaded guilty to lying to federal investigators in the investigation,