"This is a day I hoped I would never see in America," the California governor said on social media.

Gov. Gavin Newsom’s office, in a letter to the Trump administration, called the deployment of troops “unlawful” and a “serious breach of state sovereignty.”

Border czar Tom Homan confirmed to NBC News that he would arrest Gov. Gavin Newsom and Los Angeles Mayor Karen Bass if they interfered with immigration raids.

The governor is in a showdown with the president over the policing of protests in LA and Paramount – key US politics stories from Sunday 8 June at a glance

Newsom made clear that he wouldn't be cowed by threats from the White House official.

Gavin Newsom said he planned to file a lawsuit against Trump in response to the administration’s extraordinary deployment of the National Guard to confront immigration protesters…

California governor throws down gauntlet to Tom Homan as he rages against administration’s intervention in Los Angeles unrest, accusing president of ‘manufacturing a crisis’

California governor Gavin Newsom has sent a direct message to US President Donald Trump as violent clashes continue in Los Angeles. Protesters and the authorities were embroiled…

California governor plans to sue Trump administration over deployment of 2,000 national guard troops to LA which he called ‘an illegal act’

Trump is "unhinged right now," Gov. Gavin Newsom said, accusing the president of making the situation in LA worse by federalizing National Guard troops.

Donald Trump evoca l'arresto di Gavin Newsom per la sua opposizione all'uso della guardia nazionale contro le proteste per i raid anti immigrati. (ANSA)

Donald Trump evoca l'arresto di Gavin Newsom per la sua opposizione all'uso della guardia nazionale contro le proteste per i raid anti immigrati. (ANSA)

President Donald Trump said he would support arresting California Gov. Gavin Newsom and called the rioters in Los Angeles 'insurrectionists.'

Trump lashed out at Newsom - who has been tipped as a possible 2028 presidential candidate - over unrest, saying: ‘He’s done a terrible job’.

California governor has no choice but to halt his drift Right-ward after US president ‘invades’ his state with troops

"This is a day I hoped I would never see in America," the California governor said on social media.

Trump said Newsom should be arrested. The California governor is initiating a lawsuit against the Trump administration. Their rivalry goes back years.

President Trump said that Gov. Gavin Newsom should be arrested for his governance of California, while Mr. Newsom issued a barrage of retorts online.

Gov. Gavin Newsom has clashed in several GOP officials over the hostile LA protests from Vice President JD Vance to U.S. Senator Tom Cotton.

"What's so absurd about that question is I've actually thought about it," the governor said.

President Donald Trump has called for the California governor's arrest over trying to block the deployment of the National Guard.