Yet another attack thought to be done by Iranian-backed militants has led to the death of three U.S. soldiers and injuries for more than two dozen others -- leading to more pressure being placed on the White House.Former U.S. National Security Advisor under Former President Trump, Robert O'Brien, discusses how the U.S. got into this position where countries like Iran believe they can conduct such attacks without intense punishment and what should be done militarily to prepare for the possibility of escalation overseas.

Follow Martha on Twitter: @MarthaMacCallumLearn more about your ad choices. Visit megaphone.fm/adchoices