Harris: Sessions' 'credibility is shot'

Sen. Kamala HarrisKamala Devi HarrisSenate passes 6B defense bill Cuomo will not deploy National Guard to border over Trump family separation policy Colorado governor bars state resources for Trump family separation policy MORE (D-Calif.) slammed Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsSessions responds to Nazi comparisons: 'They were keeping the Jews from leaving' Laura Ingraham: Migrant child detention centers 'essentially summer camps' Senate chaplain offers prayer 'as children are being separated from their parents' MORE on Wednesday after he compared California to the Confederate states in the Civil War. 

"As far as I’m concerned, Jeff Sessions should be advised, and I’ll advise him right now, that it’s a bad idea, for him, to start talking about anything to do with the history of slavery or reconstruction or the Civil War in the United States," Harris told MSNBC's Chris Hayes. 

“His credibility is pretty much shot on those issues,” she continued. 

Sessions on Wednesday announced a lawsuit against California over its immigration policies during a speech to the California Peace Officers’ Association in Sacramento. 

The attorney general compared California to the Confederate states that seceded during the Civil War. 

“I understand that we have a wide variety of political opinions out there on immigration. But the law is in the books and its purposes are clear and just,” Sessions said. 

“There is no nullification. There is no secession. Federal law is the supreme law of the land. I would invite any doubters to go to Gettysburg, to the tombstones of John C. Calhoun and Abraham Lincoln. This matter has been settled,” he said. 

The Department of Justice has filed a lawsuit against California in an effort to block three so-called sanctuary laws that the state's legislature passed last year in response to the Trump administration's immigration enforcement measures.

Sanctuary cities encourage local authorities not to implement federal immigration law.

Harris called the Justice Department's suit hypocritical. 

“It’s hypocrisy at its height. Again, I think there’s a distraction in that they’re trying to suggest that this is about the constitution when in fact, what they’re doing is playing politics,” she said. “They’re playing politics and they’re playing politics with California.”

California's Gov. Jerry Brown (D) ripped the suit, calling it a political stunt in a tweet mocking President TrumpDonald John Trump20 weeks out from midterms, Dems and GOP brace for surprises Sessions responds to Nazi comparisons: 'They were keeping the Jews from leaving' Kim Jong Un to visit Beijing this week MORE on Wednesday.