Protests live updates: Marines make 1st temporary detention in LA

President Donald Trump, accompanied by Secretary of State Marco Rubio, spoke to reporters on the tarmac on Sunday before departing for Camp David.

As protests over immigration enforcement operations continue in Los Angeles, the president did not rule out sending active-duty Marines to California, confirming Secretary of Defense Pete Hegseth's earlier suggestion.

Trump's comments come as California National Guard troops arrived in Los Angeles on Sunday, a decision that drew ire from Democratic governors, including California's Gov. Gavin Newsom.

When asked what the bar is to send Marines, Trump said the bar is "what I think it is."

"The bar is what I think it is. If we see danger to our country and to our citizens, and we'll be very, very strong in terms of law and order," Trump said.

Trump also claimed that protestors are spitting at police officers and suggested a new saying he's created: "they spit, we hit."

"They spit, we hit," Trump said. "I told them, nobody's gonna spit on our police officers, nobody's gonna spit on our military, which they do, it is a common thing. They get up to them and go this far away, and then they start spitting in their face. If that happens, they get hit very hard."

-ABC News' Kelsey Walsh

In a joint statement released Sunday through the Democratic Governors Association, 22 Democratic governors called President Donald Trump's deployment of the National Guard in California in response to protests over immigration enforcement operations "an alarming abuse of power."

"It’s important we respect the executive authority of our country’s governors to manage their National Guards — and we stand with Governor Newsom who has made it clear that violence is unacceptable and that local authorities should be able to do their jobs without the chaos of this federal interference and intimidation," the statement reads, in part.

-ABC News' Oren Oppenheim

President Claudia Sheinbaum of Mexico said on Sunday that 35 Mexican citizens were arrested in Los Angeles raids conducted by U.S. Immigration and Customs Enforcement on Friday.

The ICE raids set off violent protests and clashes between demonstrators and immigration officers, officials said.

Sheinbaum said Mexican authorities, including staff from the Mexican Consulate in Los Angeles, are in touch with those arrested.

"Mexicans living in the United States are good men and women," Sheinbaum said. "These are men who left for the United States to seek a better life for themselves and their families. They are not criminals. They are good men and women."

-ABC News' Victoria Beaule

The U.S. Northern Command has confirmed that National Guard troops are on the ground in Los Angeles.

The California National Guard 79th Infantry Brigade Combat Team (IBCT) "has deployed approximately 300 soldiers to 3 separate locations in the greater Los Angeles area," the U.S. Northern Command posted on X.

"They are conducting safety and protection of federal property & personnel," the post added.

The announcement came about an hour after a previous post confirming that the deployment had begun, noting that "additional information will be provided as units are identified and deployed."

The U.S. Northern Command's mission is to "provide command and control of Department of Defense homeland defense efforts and to coordinate defense support of civil authorities," according to its official website.