Once the FBI Gestapo gets a FISA warrant they can use the "two hop rule".
The director of the NSA warned Trump that the FBI Gestapo was illegally wiretapping him.
by WorldTribune Staff, May 1, 2019 On March 4, 2017, just 43 days after taking office, President Donald Trump tweeted: “Terrible! Just found out that Obama had my ‘wires tapped’ in Trump Tower just…
www.worldtribune.com
On March 4, 2017, just 43 days after taking office, President Donald Trump tweeted: “Terrible! Just found out that Obama had my ‘wires tapped’ in Trump Tower just before the victory. Nothing found. This is McCarthyism!” The person who initially tipped off Trump (on Nov. 17, 2016) that communications from Trump Tower were being tapped was Adm. Mike Rogers, then-head of the National Security Agency (NSA).
President Donald Trump very well could have been wiretapped by FBI on the basis of the Carter Page warrants, and it would have been completely legal.
www.westernjournal.com
What this means is that not only could the FBI listen in on a person who is under a surveillance warrant, like former Trump campaign aide Carter Page was, but that the FBI could also listen in on any phone conversations by those with whom Page was in touch or by those who were talking to people Page was talking to.