Exclusive: U.K. Foreign Secretary Cameron's immigration's warning to senators

David Cameron brought immigration warnings about Europe’s populist uprising to Washington this week — just as senators are trying to negotiate a border security deal.

The former British prime minister, now foreign secretary, was dispatched Washington this week for meetings with top lawmakers. He told senators that he knows from his own experience how potent voter backlash over immigration can become.

“He said, these governments one after the other been falling on the left and on the right over immigration,” recalled Sen. Mitt Romney (R-Utah) in an interview. “He said he lost on Brexit because of immigration. He said, 'If you don't fix immigration, immigration will fix you.'”