https://www.nytimes.com/2019/01/14/us/politics/nato-president-trump.html
Trump Discussed Pulling U.S. From NATO, Aides Say Amid New Concerns Over Russia
Senior administration officials told The New York Times that several times over the course of 2018, Mr. Trump privately said he wanted to withdraw from the North Atlantic Treaty Organization. Current and former officials who support the alliance said they feared Mr. Trump could return to his threat as allied military spending continued to lag behind the goals the president had set.
Now, the president’s repeatedly stated desire to withdraw from NATO is raising new worries among national security officials amid growing concern about Mr. Trump’s efforts to keep his
meetings with Mr. Putin secret from even his own aides, and
an F.B.I. investigation into the administration’s Russia ties.
A move to withdraw from the alliance, in place since 1949, “would be one of the most damaging things that any president could do to U.S. interests,” said Michèle A. Flournoy, an under secretary of defense under President Barack Obama.
“It would destroy 70-plus years of painstaking work across multiple administrations, Republican and Democratic, to create perhaps the most powerful and advantageous alliance in history,” Ms. Flournoy said in an interview. “And it would be the wildest success that Vladimir Putin could dream of.”
Retired Adm. James G. Stavridis, the former supreme allied commander of NATO, said an American withdrawal from the alliance would be “a geopolitical mistake of epic proportion.”
“Even discussing the idea of leaving NATO — let alone actually doing so — would be the gift of the century for Putin,” Admiral Stavridis said.