It was for phone taps, not a computer.
"[In June], the FISA court reportedly turned down the Obama Justice Department’s request, which is notable: The FISA court is notoriously solicitous of government requests to conduct national-security surveillance (although, as I’ve noted over the years, the claim by many that it is a rubber-stamp is overblown). Not taking no for an answer, the Obama Justice Department evidently returned to the FISA court in October 2016, the critical final weeks of the presidential campaign. This time, the Justice Department submitted a narrowly tailored application that did not mention Trump. The court apparently granted it, authorizing surveillance of some Trump associates. It is unknown whether that surveillance is still underway, but the New York Times has identified – again, based on illegal leaks of classified information – at least three of its targets: Paul Manafort (the former Trump campaign chairman who was ousted in August), and two others whose connection to the Trump campaign was loose at best, Manafort’s former political-consulting business partner Roger Stone, and investor Carter Page."

Now this is all from "anonymous sources" but so is most everything that is being leveled at Trump so...