California Gov. Gavin Newsom says Trump's Justice Department is investigating him

California Gov. Gavin Newsom announced Monday that the U.S. Department of Justice has begun investigating him and members of his family, as well as friends and former employees.

It was not immediately clear what the investigation sought. Gov. Newsom alleged the DOJ was "simply trying to find" evidence of any crimes.

"Donald Trump isn't just coming after me because of my mean tweets," Newsom said in a video statement. "He's coming after me because I am considering running for President. Because he hates that I've consistently called him out over and over again for his lies and deceit. Donald Trump is simply the most corrupt President in American history."

Newsom went on to criticize more of President Trump's actions, accusing him of using the office of the presidency to enrich himself and his family through tariff policies, cryptocurrency, branded merchandise and by accepting a jet airliner as a gift from Qatar.

Newsom promised to fight what he called President Trump's "lawlessness" and the investigation against him.

"Mr. President, come after me. I am not going anywhere," Newsom said.