Domestic politics in the United States may influence the final decision on whether to sanction Venezuela's oil sector. Sens. John Cornyn of Texas, Bill Cassidy of Louisiana and Thad Cochran and Roger Wicker, both of Mississippi, sent a letter to President Donald Trump on Aug. 10 to urge him not to sanction Venezuela's oil sector. The letter said that U.S. Gulf Coast refiners could face “major losses” from sanctions against Venezuela's oil industry. The senators also warned that the sanctions could drive Venezuela politically closer to Russia and China....