A newly declassified report shows the FBI trawled through vast troves of Americans' communications collected by the National Security Agency

Despite previous warnings it was violating the Constitution, the report reveals how the FBI continues to use warrantless searches for routine criminal cases  

A single request from an FBI analyst for NSA data 'in connection with predicated criminal investigations relating to domestic terrorism' turned up 33 hits 

It's unclear from the heavily-redacted FISA court report whether it uncovered any criminal extremist behavior or made any arrests resulting from the searches 

A senior FBI official told the DailyMail.com the FBI had taken 'numerous steps' to comply with the FISA court guidance over the past 18 months

It comes as the DHS vows to root out domestic extremists within its ranks, and Congress ponders new domestic terror laws