Hundreds of U.S. Marines arrived in the Los Angeles area on Tuesday under orders from President Donald Trump, ratcheting up tensions in America’s second largest city, as California’s governor warned “democracy is under assault.”

Trump’s extraordinary measures of sending National Guard and Marines to quell protests, which broke out in response to his immigration raids, fueled demonstrations for a fifth day in Los Angeles, and sparked protests in several other cities.

As Trump and Newsom traded fulminations, the city’s mayor said the protests were limited to about five downtown streets, but declared a curfew for parts of the downtown area due to violence and looting.

Police arrested another 197 people on Tuesday – more than double the total number of arrests to date.

Democratic leaders have raised concerns over a national crisis in what has become the most intense flashpoint yet in the Trump administration’s efforts to deport migrants living in the country illegally, and then crack down on opponents who take to the streets in protest.