Rachel Maddow has spoken of her tussles with the Koch brothers on-air before, and last night she did it again with a blistering indictment of the legal letter sent to her on the Kochs’ behalf to publicly correct a report she did on them. Maddow did a report this week on Florida’s “drug test the poor” law (now on its way out) being tried in other states, partly at the urging of a conservative group that’s part of a network that receives funding from the Koch brothers.

Maddow said, “Very frequently, when we cover the Koch brothers, we then hear from the Koch brothers’ lawyer.”

She showed the letter that the lawyer sent, including a script for her to read clarifying that they are “not involved in promoting any such issue.” Maddow said quite sternly, “I’m not going to read their script. I’m not going to renounce my own reporting on this story, because the reporting on this story stands. It is true.”

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