Trump acts "like he's doing 'The Apprentice' or something," Corker, the Republican chairman of the Senate Foreign Relations Committee, reportedly told the Times. The senator added he was concerned by the president's behavior, the outlet said.
Obama invited Modi for one of the last big visits by a world leader before his term ends in January. Although the trip won't feature a lavish state dinner, the PM will address both houses of Congress, considered a rare honour.
US Secretary of State John Kerry on Thursday mounted a furious counterattack against critics of the Iran nuclear deal, telling sceptical lawmakers it would be fantasy to think the United States could simply "bomb away" Tehran's atomic know-how.