Lawrence: When Donald Trump says ‘if you want to know the truth,' he lies

Tonight on The Last Word: The U.S. strikes Iran after an Army helicopter is downed. Also, the House Oversight Committee questions Jeffrey Epstein aide Lesley Groff. Plus, a trade judge tells Donald Trump to speed up tariff refunds. The Trump Administration is detaining children at a staggering rate. And GOP candidate Steve Hilton advances to the California governor’s election against Xavier Becerra. Rep. Adam Smith, Ali Velshi, Rep. James Walkinshaw, Rep. Brendan Boyle, and Jacob Soboroff join Lawrence O’Donnell.