Rep. Eric Swalwell, a California Democrat on the House Intelligence Committee, refuses to discuss his relationship with a woman suspected of being a Chinese spy and whom intelligence officials say had romantic relationships with two unnamed Midwestern city mayors.

Fang Fang, also known as Christine Fang, a Chinese national believed to be working with China’s Ministry of State Security, conducted an extensive political influence operation between 2011 and 2015 on behalf of the Chinese Communist Party in the Bay Area and elsewhere, according to a report by Axios, which cited U.S. intelligence officials.