The special counsel’s investigation is not about Trump. It is about our national security. Every American should be rooting for Mueller’s success in determining precisely how Russia interfered in our fundamental democratic process. I had no illusions about the Soviet Union during the Cold War, and I have none about Putin now. Mueller’s most recent court filings indicate that Putin is seeking to meddle in this year’s elections. Secretary of State Mike Pompeo, Director of National Intelligence Daniel Coats and FBI Director Christopher A. Wray — all Trump appointees confirmed by the Republican-led Senate — have also warned of foreign interference. We should heed these warnings and empower Mueller to see his important work through to its conclusion.

I have worried over the years about runaway legal authority, and I’ve battled against activist judges. I don’t worry about Robert Mueller. He is a lifelong Republican with a career of distinguished service running the Criminal Division of the Justice Department for President Ronald Reagan and serving as President George W. Bush’s FBI director, twice unanimously confirmed by the Senate. And his investigation is getting results: By any objective standard, he has moved swiftly, obtaining 23 indictments and five guilty pleas in just more than a year.

Congress must never abandon its role as an equal branch of government.