President Obama said in an interview broadcast Sunday that Republican presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE's comments about NATO show he is unprepared to address issues of foreign policy.

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"I think that anybody who's been paying attention knows there is a big difference between challenging our European allies to keep up their defense spending, particularly at a time when Russia's been more aggressive, and saying to them, 'You know what? We might not abide by the central tenant of the most important alliance in the history of the world,' " Obama said on CBS's "Face the Nation."

Obama said NATO was created by Democrats and Republicans and has been a "cornerstone of U.S. foreign policy since the end of World War II."

"For Mr. Trump, who has in the past suggested that America's weak and not looking out for its allies, to then maybe not have enough information or understanding to go out and say that America might not stand by its solemn commitment to protect those same allies who stood with us after 9/11 when we were attacked," Obama said, "I think is an indication of the lack of preparedness that he has been displaying when it comes to foreign policy."

Trump last week said there are some conditions that would have to be in place before he would help NATO allies.

“If they fulfill their obligations to us, the answer is yes,” he said.

"We are spending a fortune on military in order to lose $800 billion. That doesn’t sound very smart to me."