Updated: Aug 7, 2020
CNN article by Luke McGee with my contribution.
"However, longstanding observers of the alliance accept it has been strained over the past four years -- and will worsen still if Donald Trump beats former vice president Joe Biden in this year's US election. "Trump considers the EU, especially Germany, an economic and trade rival, which means tensions can be expected in the case he gets a second term," says Velina Tchakarova, from the Austrian Institute for European and Security Policy.
She says that as the EU is taking steps toward "building stronger autonomy in the field of security and defence," Trump tries to "undermine such efforts through his attacks on the European NATO members as well as through economic and trade measures."
Link to the article