PBS News Hour S42 E77 April 18, 2017

Tuesday on the NewsHour, we dig into transparency issues for the Trump White House. Also: The president's efforts to revamp a widely used guest workers program, a call for snap elections in the U.K., pushback against Mr. Trump's upcoming state visit to Britain, Sen. Ben Cardin talks Russia, North Korea and Turkey, and inspiring students in the Navajo nation with hands-on learning.