That is probably a safe bet that Senator Paul, his family, his staff and anyone he contacted or was contacted by phone were “surveilled”!
Even the article said that there isn’t a law against this type of thing:
Paul and many civil libertarians argue that, since foreign surveillance requires no warrant, Americans caught up in that surveillance are being observed without a warrant.
Foreign, warrantless surveillance is authorized under Section 702 of the Foreign Intelligence Surveillance Act, which comes up for renewal later this year. Comey has described Section 702 as the “crown jewels” of FBI surveillance tools.