The Republican chairman of the US Senate Foreign Relations Committee, who will play a central role in determining the congressional response to the Iran nuclear deal, said on Tuesday he begins 'from a place of deep skepticism' as he considers the agreement. Senator Bob Corker had tough words for Iran in a statement, saying it continues as the world's 'lead sponsor of terrorism' and that relieving sanctions would leave it 'flush with cash' and increase threats to the United States and its allies.