This is a man who has previously stated he would prefer Hillary Clinton had led negotiations on the nuclear agreement with Iran. He has expressed a willingness to allow Vladimir Putin to dominate the Middle East by aligning with Iran and propping up the ruthless Syrian dictator, Bashar al-Assad — an action that would only worsen the existing refugee crisis and endanger our national-security interests and those of Israel. And he has been ignorant and dismissive of the world’s most dangerous terrorist organizations, saying that we shouldn’t have gone into Afghanistan to hunt al-Qaeda and end the safe haven for terror provided by the Taliban, only to retreat from that stance this week.

Let’s be clear: Donald Trump simply doesn’t know what he’s talking about. And his bluster overcompensates for a shocking lack of knowledge on the complex national-security challenges that will confront the next president of the United States.