Wall Street set to open lower

Wall Street was set to open lower on Tuesday as investors sought safe-haven assets following British Prime Minister Theresa May's comments on Brexit and U.S. President-elect Donald Trump's remarks on the dollar. May said Britain would leave the European Union's single market when it exits the EU, but the final deal would be put to a parliamentary vote, helping U.S. stock futures trim some losses. The dollar index fell 0.5 percent against a basket of major currencies after Trump told the Wall Str