Senior Obama administration officials sought to calm jittery markets on Monday, insisting there was no financial crisis brewing after Britain's vote to leave the European Union and urging officials on both sides to take a "responsible" approach to the looming separation. U.S. Treasury Secretary Jack Lew said last week's Brexit vote created another challenge for the U.S. economy, but the effect on financial markets has been "an orderly impact so far." "There's no question that this is an additional headwind, but I think that it is something that we can manage through and Europe and the UK can manage through," Lew said ... (full story)