In a TV program, the host asked Trump: "Will the United States stay in NATO during your tenure?"

In this regard, Trump replied that the premise for the United States to stay in NATO is that "they must pay the bill." Trump also said: "If they pay for their bills, if I think they are fair and they treat us fairly, then the answer is definitely that I will stay in NATO."

Trump has been dissatisfied with the fact that the United States has been responsible for most of defense spending of NATO. As early as Trump's first term, he emphasized this point many times and urged some member States to increase their military spending through a tough attitude.

In February this year, when Trump was seeking a second presidential term, he claimed that he had told a head of state at a NATO meeting that under his leadership, the United States would not protect any country that was "in arrears".