In a recent column, I explained how the still-forming Trump administration is already doing serious harm to America’s longstanding global intelligence partnerships. In particular, fears that the White House is too friendly to Moscow are causing close allies to curtail some of their espionage relationships with Washington—a development with grave implications for international security, particularly in the all-important realm of counterterrorism. Now those concerns are causing problems much closer to home—in fact, inside the Beltway itself. Our Intelligence Community is so worried by the unprecedented problems of the Trump administration—not only do senior officials possess troubling ties to the Kremlin,...