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Why the subpoena for Robert Mueller is so important

Robert Mueller didn't want to testify to Congress, but he's going to anyway. There a couple of reasons this is so critically important.

Image: US-POLITCS-FBI-MULLER
Federal Bureau of Investigation(FBI)Director Robert Mueller testifies during a hearing of the Senate Appropriations Committee's Commerce, Justice, Science,…AFP/Getty Images

Steve Benen is a producer for "The Rachel Maddow Show," the editor of MaddowBlog and an MS NOW political contributor. He's also the bestselling author of "Ministry of Truth: Democracy, Reality, and the Republicans' War on the Recent Past."