"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.