But only under one condition:
We must FIRST, and covertly initially, have superior weapons and in sufficient numbers to provide defense.
If we have a few thousand proton-based weapons to deal with any major external threats, or both ground-based and air or space-based energy weapons (laser or such) to disable incoming threats, then fine -- get rid of nuclear arms. They are old tech anyway.
We've had nuclear arms for some sixty years. We should be able to come up with something better that doesn't fall under some agreement that otherwise isn't in our best interest.
And if our enemies don't want us to have them, fine -- don't tell them. They'll find out if they test us.