California Gov. Gavin Newsom said Monday that the Department of Justice is investigating him as well as his wife, Jennifer Siebel Newsom, though he did not specify what the alleged inquiry targets.

In a video post on social media, he said federal agents had recently knocked on the doors of family, friends and former employees — "not because they found a crime, because they're simply trying to find one."

His office told reporters it believes grand jury subpoenas were issued to financial institutions for records, based on questions people connected to Newsom were asked, and said it has not seen any subpoenas itself.

Newsom framed the inquiry as an attack on his family rather than on his own conduct.

"Just in the last week, I've learned his campaign has reached my own home: to get me, he's coming after my wife, Jen," he said, calling her a public servant who leads two gender-equity organizations, the Representation Project and the California Partners Project.

He added, "You can subpoena my records... but leave my wife and family out of your personal vendetta." A Justice Department spokesperson declined to comment to ABC News about the investigation.

Sources familiar with the matter told ABC News that California investigators began examining Siebel Newsom's taxes in 2025.

According to ABC News, the investigation is believed to be run out of the U.S. Attorney's Office for the Eastern District of California, where Newsom's former chief of staff Dana Williamson pleaded guilty in May to bank fraud and other charges — a case that involved no allegations of wrongdoing by Newsom or his wife.

The Washington Examiner reports the probe reportedly stems from U.S. Attorney's Office whistleblower complaints in Sacramento and appears to be exploring the couple's taxes and ties to certain nonprofits.

Newsom's office said it is not aware of any target letters, which would signal imminent charges, and says the proceedings do not appear narrowly focused on personal finances.

Newsom, a widely considered frontrunner for the 2028 Democratic nomination, says the investigation will not deter him.

Speaking at a campaign event in Nashua, New Hampshire, where he stumped for Senate nominee Chris Pappas and other Democrats, he told the Washington Examiner the inquiry makes him "more resilient" and gives him an "intimate understanding of the weaponization" at the DOJ, FBI and IRS.

"I will make a determination after the midterms, but if his intention was to get me to stand down and walk away, I assure you, it's not working," he told Politico, per the Washington Examiner.

His office is also pursuing a public records request for DOJ documents referencing him and his wife since the start of Trump's second term.