Billionaire Elon Musk on Sunday expressed his support for the U.S. exiting NATO, saying it "doesn’t make sense for America to pay for the defense of Europe." Musk, who is advising U.S. President Donald Trump on plans to shrink the U.

Billionaire Elon Musk threw his weight behind a US exit from NATO, saying on his social media platform that it “doesn’t make sense for America to pay for the defense of Europe.”

President Donald Trump is expressing uncertainty that NATO would come to the United States’ defense if the country were attacked

European Union leaders on Friday downplayed skepticism from U.S. President Donald Trump about solidarity among NATO members a day after they backed plans to spend more on defense amid wavering U.S. support.

Asked about NATO Article 5 commitment, Trump says U.S. "not going to defend" allies that fail to meet his spending requirements.