“There wouldn’t be much of an impact (of joining),” said Stephen Farnsworth, professor of political science at the University of Mary Washington. “I think the main thing is that President Trump is trying to do is to demonstrate just how tight the connection is between the UK and the US, particularly at a time when you see the president getting into some difficult environments with some other NATO allies.”

The interview with Dr. Farnsworth starts at 13:20: Link