When Cruz made the remarks about "violent insurrection" I had a feeling he may be laying a rhetorical trap could he prove the FBI an active, if not driving participant in any criminal actions taken on 1/6.
Now it appears he is stepping up and using that possibility (unproven, but likely, given past FBI ops) to raise funds and turn the heat up.
In the event that the agents, employees, or informants of the FBI were among or the leading instigators or participants in that "violent insurrection", Cruz has them trapped by their actions which were never intended to be disclosed to the Public at large, and strips the whole "get Trump" case out from under Pelosi's witch hunt.