Lawrence: Trump retreats on Iran and proves he’s worse than Nixon

Tonight on The Last Word: Oil prices fall after Donald Trump retreats on Iran strikes. Also, Trump sends ICE to airports amid the TSA funding fight. And the North Carolina race is key to Democrats taking the U.S. Senate. Rep. Adam Smith, Amos Hochstein, Rep. James Walkinshaw, and former Gov. Roy Cooper join Lawrence O’Donnell.