 He's made it clear that he would feel no obligation to honor Article 5. Trump on the campaign trail recently admitted he didn't know much about NATO until he attended a meeting. I didn't even know what the hell NATO was too much before, but it didn't take me long to figure it out, like about two minutes. Trump went on to tell the story that he had warned NATO members the U.S. would not come to their aid if they didn't increase military spending. Most European allies say President Biden has strengthened the alliance that had frayed under Trump.