Former White House chief of staff Mick Mulvaney claims US President Donald Trump’s deal with Russia is a strategic play to lower the price of diesel across the United States. “You can make the argument that you might do that in order to try and lower the price of diesel going into the midterms,” Mr Mulvaney told News24. “It's unlikely to have any impact whatsoever between now and the midterms. “He hasn't really given detail as to why it's in the best interests, but that’s the excuse he gave when he said he was cutting this deal.”