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U.S. National Security Adviser Susan Rice said on Sunday that there are "relatively few" immediate security concerns stemming from Britain's vote to leave the European Union, but the United States will work to ensure continued U.S.-UK cooperation on counter-terrorism and other security issues. "We will do all we can to ensure that the areas in which we are cooperating -- counter-terrorism, you name it, will remain solid," Rice said.
U.S. stock index futures eased slightly in early trading on Sunday after Britain's vote to leave the European Union sparked a sharp sell-off in global markets on Friday, wiping out over $2 trillion from world equities. Investors were blindsided by Thursday's vote, having bid up equity markets in the days leading up to it. U.S. stock indexes had been in striking distance of all-time highs, with some expecting a sharp rally to new highs in the coming days.