The US Government only gives a shit when they are caught. You'd have a damn hard time trying to prove mass surveillance to a court even though we all know they do it.
As long as its a legit number that uses a popular carrier that supports modern protocols they should come through. I'd test it out yourself if you have any concerns.
Use Carrion from F-Droid and make it your screening app. Numbers that call you have to go through a verification that is mandated in the US & Canada. Numbers that fail this handshake verification will be rejected.