Washington, May 30 -- US Secretary of State Marco Rubio said Wednesday he will "aggressively" revoke visas to students from China, long a top source of revenue for US universities, striking defiance after Beijing complained about a suspension in visa processing. US President Donald Trump's administration will "aggressively revoke visas for Chinese students, including those with connections to the Chinese Communist Party or studying in critical fields," Rubio said in a statement. The order also bars any additional student or exchange visa until further orders....