The Last Word

On Tuesday's Very Last Word, MSNBC's Ari Melber explained the difference between top-down and bottom-up political scandals, and how Richard Nixon was the progenitor of the top-down kind. Also, Joy Reid talked about how two military officials tasked with overseeing sexual assault cases could commit assaults themselves.

President Obama responds to the Treasury Inspector General's report which found that IRS officials used 'inappropriate criteria' in evaluating organizations' applications for 501(c)(4) tax-exempt status. MSNBC's Lawrence O'Donnell discusses with former House Judiciary Committee counsel Julian Epstein and MSNBC's Ari Melber.

President Obama says he 'will not tolerate' any inappropriate political targeting by the IRS. But MSNBC's Lawrence O'Donnell explains that the IRS has been inappropriately interpreting the law governing 501(c)(4) organizations for more than fifty years. The Washington Post's Ezra Klein joins.

Minnesota's Democratic Governor Mary Dayton has signed marriage equality into law, making the state the 12th in the nation to grant same-sex couples the right to marry. He joins MSNBC's Lawrence O'Donnell on this historic day for Minnesota.