Two U.S. senators say that they were denied visas as part of an official delegation to Russia for talks with their counterparts in the country's parliament. Amid tensions over arms control, human rights, and Russian aggression in Ukraine, Venezuela, and Syria, it's a sign of the frayed ties between Washington and Moscow, despite President Donald Trump's consistent calls for better relations with President Vladimir Putin's government -- including its readmission to the G-7. Republican Ron Johnson of Wisconsin and Democrat Chris Murphy of Connecticut were scheduled to leave on their trip next week, according to aides, with stops in Ukraine,...