Even before all of this, we knew that the FBI was spying on members of the Trump campaign and that they were wire-tapping Trump tower.
Once Trump won the election, they would continue to conspire against the newly elected POTUS.
McCabe says Rosenstein was 'absolutely serious' about secretly recording Trump
The FBI/DOJ wanted to wire Rosenstein (He was complicit) so that he could secretly record conversations with the President. These recordings would then be played to Trump's cabinet members to make a case for invoking the 25th Amendment to remove a duly elected POTUS. In addition, we also know that at around the same time, the FBI launched a bogus investigation into Trump for what is essentially treason because he fired one of their own (Comey). This is the attempted coup that happened more than 100 days into Trump's presidency.
Strzok and Page both were within the FBI when both Operation Crossfire Hurricane and the coup attempt were taking place. Based on the IG report, there were other unnamed FBI agents involved as well.