Speaking to the New York Times Mr Trump said the US would only come to the aid of allies if they have "fulfilled their obligations to us".
Members of Nato have all signed a treaty that says they will come to the aid of any member that is attacked.
Mr Trump will speak on Thursday at the Republican National Convention.
In a preview of what he will tell convention-goers in his speech, he outlined a foreign policy strategy aimed at reducing US expenditure and involvement abroad.
Although the White House has not responded directly to Mr Trump's comments, spokesman Josh Earnest said on Thursday the US commitment to NATO was "ironclad".
He said potential enemies should not misjudge Washington's commitment to defend its NATO allies.
"The president renewed that commitment just two weeks ago today when he travelled to Warsaw, Poland, to attend the NATO summit."
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