Brexit deal legal advice sends pound tumbling

The pound tumbled Tuesday after the UK government's top legal advisor cast doubt on Prime Minister Theresa May's last-gasp changes to her Brexit deal, hours before a vital vote. Sterling, which had been rising after May secured revisions to the Brexit withdrawal agreement, hit reverse after legal advice from Attorney General Geoffrey Cox. Cox said last-minute new agreements "reduce the risk" of Britain being "indefinitely and involuntarily" held in the so-called Irish border backstop.