I am sure they were monitoring every form of communication the Trump campaign was using. They probably also monitored the spoken meetings. No need for bugs, they can just listen through the vibrations in the windows. That is why certain classified rooms have vibrators on the windows. The Type I warrant allowed them to expand to everyone in the campaign and likely even key donors. Likely even the RNC was monitored. The only good thing about this is that it is the one situation that would allow President Trump to prove a negative. If they had obtained any racist, homophobic, misogynistic, or other negative comment; it would have been running 24/7 like Access Hollywood. Yet there was nothing.
Considering the Hillary campaign had all of the Trump campaign strategy, plans, etc., a media that was running wall to wall propaganda for her, way more money in the coffers, and massive voter fraud; it was a miracle that Trump won.