A suspected Chinese intelligence operative developed extensive ties with local and national politicians, including a U.S. congressman, in what U.S. officials believe was a political intelligence operation run by China’s main civilian spy agency between 2011 and 2015, Axios found in a yearlong investigation. Axios broke the story on Fang, alleging she had sexual and romantic relationships with two unnamed Midwestern mayors, including one in Ohio. She also forged political connections with a host of local and national politicians, among them a U.S. congressman, according to Axios. Rep. Eric Swalwell (D-Calif.) is refusing to say if he had sex with...