Trump makes policy pledge to senator investigating son's Russia meeting

Donald Trump greets Chuck Grassley on the campaign trail last year.Donald Trump called a senior Republican senator from Iowa on Wednesday whose congressional committee is investigating his son, Donald Trump Jr, and promised him critical federal support for the biofuel ethanol, a key issue for the lawmaker.Chuck Grassley, the chairman of the Senate judiciary committee and a major advocate of the ethanol industry, announced on Twitter that he had received a phone call from Trump and had been assur