The US has a treaty obligation to NATO. It’s not like the phoney “Paris Agreement” which doesn’t even exist on paper. Trump can’t take us out unilaterally by executive order or some such. He knows it, Bolton knows it, but getting airtime even with a smear is always worth it to the likes of Bolton.
That means zip...Eff NATO!
Btw, the U.S. government has a duty and obligation to protect and secure our border. How'd that work out for the U.S. taxpayers?