California, Jumada I 7, 1437, Feb 16, 2016, SPA -- U.S. President Barack Obama will visit Vietnam in May during a trip to Asia, Reuters quoted a White House official as saying. Obama accepted the invitation by Vietnamese Prime Minister Nguyen Tan Dung during a meeting at a summit of Southeast Asian nations in California. "The president and Prime Minister Dung discussed the continued strengthening of U.S.-Vietnam relations in 2015, which marked the 20th anniversary of the restoration of diplomatic relations," the official said. --SPA 11:43 LOCAL TIME 08:43 GMT www.spa.gov.sa/w