Overview: Headlines for August 16, 2016; 'Extreme Vetting': Trump Vows Ideological Test for Immigrants & Return to McCarthy-Era Repression; Matt Taibbi on Trump's Position on NATO, Russia & his Campaign Head's $13 Million Scandal in Ukraine; 'What Would She Do in Iraq': As Clinton Slams Trump for ISIS Speech, We Look at Her Own Positions; Writer Jesse Washington & Olympian Anthony Ervin on Michael Jordan, Muhammad Ali & Race at Olympics