President Obama said Tuesday that Donald TrumpDonald John TrumpTrump rages against '60 Minutes' for interview with Krebs Cornyn spox: Neera Tanden has 'no chance' of being confirmed as Biden's OMB pick Pa. lawmaker was informed of positive coronavirus test while meeting with Trump: report MORE’s performance in the first presidential debate of 2016 shows he’s unfit to be commander in chief.

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Trump, the Republican nominee, demonstrated he ”doesn't have the preparation, the temperament or the core values of inclusion and making everybody have opportunities that would take our country forward,” Obama said in an interview with Ryan Seacrest.

Obama said he watched the debate between Trump and Democratic nominee Hillary ClintonHillary Diane Rodham ClintonCornyn spox: Neera Tanden has 'no chance' of being confirmed as Biden's OMB pick Groups seek to get Black vote out for Democrats in Georgia runoffs Biden's political position is tougher than Trump's MORE in the Treaty Room of the White House — where he frequently works and watches television late at night.

He said he enjoyed viewing "sharply contrasting visions about where we take the country.”  

The president said one of his greatest concerns for future generations is nuclear proliferation, an area he said Trump does not understand.

"That's why I get worried when somebody like Donald Trump start saying, 'Well, I don't necessarily know whether Japan or Korea should be protected by us. Maybe they should get their own nuclear weapon,'" he said. "That shows somebody who doesn't pay attention to these issues, and you don't necessarily want close to the nuclear button."

Obama is a frequent Trump critic and has stumped several times for the Democratic nominee, hoping to ensure she succeeds him in the White House.

The president is headlining a closed-door fundraiser for the Democratic Party later Tuesday in Washington.

The Clinton campaign has tasked Obama with attracting young voters, a constituency that helped elect him president twice but has so far been unenthusiastic about Clinton’s candidacy.

The interview on Seacrest’s radio show, which plays Top 40 hits, coincided with National Voter Registration Day.

"You should do your own homework,” Obama told listeners. “But don't sit out on this thing."

Obama also tried out some millennial lingo with Seacrest, telling him “those questions were lit.”

— This report was updated 12:56 p.m.