A former secretary of Homeland Security during the Obama's administration says President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE is a few changes short of becoming an excellent leader.

“I actually believe 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,” former DHS Secretary Jeh Johnson said Wednesday on MSNBC’s “Morning Joe.”

“If he can find some 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.”

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Johnson added that he sees Trump struggling with Twitter, national security and terrorism.

“And I’m very concerned about the tweets, obviously,” he said. "And very concerned about the direction we’re taking in a lot of national security areas.”

“I’m very concerned that we’re, when it comes to Homeland Security, we may be fighting the last war,” Johnson added. "We may be responding to the terrorist attack of 10 years ago versus the next one.”

“And given where we are right now with the current threat environment, we need to focus on home-grown, home-born violent extremists, which is something we did a lot of in the last administration.”

Trump claimed earlier this month — without evidence — that Obama wiretapped Trump Tower in New York City during the 2016 presidential race.

FBI Director James Comey said Monday the Department of Justice has “no information” substantiating Trump’s claims against his predecessor, while top Republicans on the House and Senate Intelligence committees have both said there's no evidence that Obama ordered a wiretap on Trump.