Current and former Trump administration officials are worried about what might happen on Nov. 4.
“This sustained campaign of disruption, disinformation, and denial, is aided by any leader who doesn’t acknowledge it,” President Trump’s former national security adviser said.
The former chief of staff’s public reticence has frustrated groups that are hoping that he will publicly endorse Joseph R. Biden Jr., the Democratic presidential nominee.
The report, in The Atlantic, could be problematic for the president because he is counting on strong support among the military for his re-election bid.
President Trump is said to have spoken privately for years about withdrawing from the alliance, a move that critics say would be a major victory for Russia.
Former President George W. Bush and Senator Mitt Romney won’t support Mr. Trump’s re-election, and other G.O.P. officials are mulling a vote for Joe Biden.
But what appeared to be an uneasy truce between the White House and military leaders did not mean the conflict was over.
“There is a thin line between the tolerance we have witnessed from the military for three years and the point where it becomes intolerable,” said Douglas Lute, a retired three-star Army general.