FBI files declassified in August have linked a wealthy California family that donated over $4.4 million to state Democrats with a suspected Chinese intelligence operative, according to reports.

The documents describe C.C. Yin, an 89-year-old businessman who built his fortune through McDonald’s franchises, as a “one-time professional associate” of Christine Fang, a suspected Chinese agent, through the Asian Pacific Islander American Public Affairs group. Yin’s family gave about $364,817 to Governor Gavin Newsom, plus $80,000 for his inauguration and $50,000 in behested payments, along with $221,700 to Lt Governor Eleni Kounalakis. Kamala Harris was also a recipient.

No charges have been filed, and the family denies wrongdoing. Separately, the FBI concluded that Fang helped seek unlawful campaign donations for Congressman Eric Swalwell in a 2014-17 probe that was shelved for “national security reasons”. The disclosures are likely to intensify scrutiny of foreign influence in US campaign finance The Justice Department has not commented on the declassified material.