Vice President Biden on Tuesday called on North Atlantic Treaty Organization (NATO) allies not to take 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 seriously when the Republican presidential nominee talks about scaling back U.S. support for the group.

"Our sacred honor is at stake. The fact that you occasionally hear something from a presidential candidate in the other party – it’s nothing [that] should be taken seriously, because I don’t think he understands what Article 5 is," Biden told reporters in Riga, Latvia.

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"There is continued, overwhelming, bipartisan agreement in the United States of America, both political parties, to maintain our commitment to NATO," he added.

Biden met with Latvian President Raimonds Vējonis on Tuesday and discussed last month's NATO summit in Warsaw, Poland, according to the White House.

Biden told members of the media that the U.S. commitment to NATO was reaffirmed in Warsaw, saying any concern the U.S. is somehow disengaged is "simply not true."

"I want to make it clear, absolutely clear to all the people of the Baltic states, we have pledged our sacred honor, the United States of America, our sacred honor to the NATO Treaty and Article 5. We mean what we say, we have never reneged on any commitment we have made," Biden said, according to a pool report.

Article 5 refers to the promise among members that an attack on one NATO nation is considered an attack on all of them.