Of course, not only was there nothing at all illegal about that, but the DOJ actually had to produce good evidence of criminal activity on behalf of a foreign power in order to secure that warrant from the FISA court.
So, basically, take the diametric opposite of the above posts, and you get closer to the truth.
US investigators obtained a warrant to wiretap former Trump campaign chairman Paul Manafort before and after the election
Investigators last year obtained a Foreign Intelligence Surveillance Act (FISA) warrant to conduct surveillance on Manafort, which continued through early 2017.
Former FBI agent Asha Rangappa, who served in the bureau's counterintelligence division,
explained earlier this year the FBI can request and be granted a warrant to monitor a US person from the Foreign Intelligence Surveillance Court "if they can show probable cause that the target is an 'agent of a foreign power' who is 'knowingly engag[ing]…in clandestine intelligence activities.'"
"In other words," Rangappa added, "the government has to show that the target
might be spying for a foreign government or organization."
Manafort was previously surveilled under a separate FISA authorization that began in 2014, due to scrutiny over his lobbying work on behalf of the pro-Russia Party of Regions in Ukraine and his business dealings with Russian entities.
US investigators reportedly wiretapped Paul Manafort before and after the election