Amid the controversy over Donald Trump's demand that NATO nations meet their financial obligations before they expect the United States to defend them, NATO's top commander says he agrees it's important for alliance members to pay their bills.

In an interview at the Aspen Security Forum, Army Gen. Curtis Scaparrotti said it's something he regularly discusses with other countries.

"What I tell them typically is that look, we have a people and a Congress with a tough budget as well," Scaparrotti said Thursday night. "So as a leader of another country you have to put your share into this, you have to do that because when I go back to testify to Congress I get asked these questions."

Pressuring NATO members to meet their commitments is a position Trump has not backed off of, despite criticism from Democrats and some national security experts, who argue it sends the wrong message and could embolden Russian President Vladimir Putin, who has already seized territory in Ukraine, which is not a NATO member.

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