California Gov. Gavin Newsom said on Sunday he will sue the Trump administration over the deployment of 300 California National Guard personnel to Oregon.

"We’re suing Donald Trump. His deployment of the California National Guard to Oregon isn’t about crime. It’s about power. He is using our military as political pawns to build up his own ego," Newsom wrote in a post on X. "It’s appalling. It’s un-American. And it must stop," he added.

The move comes just one day after a federal judge blocked President Donald Trump's attempt to deploy Oregon National Guard troops in Portland.

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"In response to a federal court order that blocked his attempt to federalize the Oregon National Guard, President Trump is deploying 300 California National Guard personnel into Oregon. They are on their way there now," Newsom, a Democrat, wrote in a statement. 

"This is a breathtaking abuse of the law and power. The Trump administration is unapologetically attacking the rule of law itself and putting into action their dangerous words — ignoring court orders and treating judges, even those appointed by the president himself, as political opponents."

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The White House did not immediately respond to Fox News Digital's request for comment. A spokesperson for the Pentagon referred questions about the deployment to the White House.

The president’s push to deploy National Guard troops nationwide has ignited repeated clashes with Democratic governors and mayors.

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Illinois Gov. JB Pritzker has been among the most vocal critics, condemning Trump’s ongoing proposal to send troops into Chicago — an idea the president has been promoting for weeks.

Trump has also threatened to extend deployments to other cities, including Baltimore and New Orleans. Troops have already been sent to Los Angeles and Washington.

Senate Majority Leader John Thune, R-S.D., said Sunday that some Democrats are looking for an "off-ramp" from the government shutdown when asked whether he has identified additional more lawmakers who could potentially reopen the government.

"There are conversations ongoing where Democrats, who I think realize this is a losing strategy for them… want to find an off-ramp here and are talking to Republicans," Thune told "Sunday Morning Futures" host Maria Bartiromo.

The South Dakota Republican went on to say he has had some conversations with Democratic lawmakers but added the party's leadership is "stuck" because of "left-wing special interest groups."

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"[These] groups are so adamant in their desire to fight President Trump. It's sort of this blind Trump derangement syndrome, if you will. They don't want to give the president victory on anything," he elaborated.

Thune insisted, however, that reopening the government would not constitute a victory for Trump. Instead, the move simply funds the government for the next seven weeks and allows the appropriations process to continue.

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"It's ironic in a way that this is where the Democrats have decided to pick their fight, but I think their liberal left is insisting on it… it's the tail wagging the dog right now, but there are reasonable Democrats out there who are having conversations with Republicans and I'm hopeful those are going to yield some results."

The only choice in front of Democrats, he said, is to "open up the government or else."

The leading Senate Republican's remarks come as the GOP-coined "Schumer shutdown" reaches day five with no end in sight.

Fox News senior congressional correspondent Chad Pergram reported Sunday that "no talks" and "no negotiations" have moved the needle thus far.

The Senate is slated to vote on government funding again on Monday.