"Former Homeland Security Secretary Jeh Johnson said Wednesday that he believes President Donald Trump "has the potential to be a great president," and suggested that the Trump administration's issuance of an emergency order banning passengers from carrying larger electronic devices on certain flights from the Middle East and North Africa to the United States would be good for national security. "I actually believe that Donald Trump — and I told him this when I met with him in December — I actually believe that Donald Trump has the potential to be a great president in sort of the Nixon-goes-to-China way, or Reagan-goes-to-the-Soviet-Union way, if he can find a way to rein in some of the more unhealthy impulses, listen to his staff, bring on a full complement of political appointees who will help him govern," Johnson said on MSNBC's "Morning Joe" Wednesday."