VIDEO: Rachel Maddow Says There's a Second Trump Whistleblower on THE LATE SHOW WITH STEPHEN COLBERT

MSNBC's Rachel Maddow, author of the new book "Blowout," reminds "The Late Show With Stephen Colbert" of the existence of a second whistleblower report implicating the Trump administration in potentially-criminal wrongdoing, this time at the IRS in relation to the President's tax returns.

Watch the clip below.

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