The Trump administration on Thursday announced a “significant expansion” of its ​visa restriction policy in ⁠the Western Hemisphere, targeting people working on behalf of U.S. adversaries. In its announcement, the State Department said the expanded policy allows it to restrict U.S. visas for people intentionally acting on behalf of adversarial countries to “undermine America’s interests.” “President Trump’s National Security Strategy makes clear: this Administration will deny adversarial powers...