In a previously unpublished video, White House National Security Adviser H.R. McMaster said last month that there is evidence of Russian meddling Mexico’s presidential election, which will take place in July. McMaster made the remark in a December speech to the Washington-based Jamestown Foundation. “We’ve seen that this is really a sophisticated effort to polarize democratic societies and pit communities within those societies against each other,” he said. “You’ve seen, actually, initial signs of it in the Mexican presidential campaign already.” Mexican newspaper Reforma first published a story Saturday on the comments.