US House Foreign Affairs Committee Chairman Brian Mast has warned US Secretary of State Marco Rubio of “Chinese malign influence” in a bid for a major contract in Argentina, according to a letter seen by Reuters.The April 23 letter concerns an auction for a 25-year contract to dredge and operate Argentina’s Parana River, a vital waterway for most of the country’s agricultural exports, that Argentina estimates will reach US$10 billion in investment.The terms of the tender, which is in its...