Ex-CIA chief slams GOP's 'reckless partisan behavior' over memo
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“I had many fights with Congressional Dems over the years on national security matters,” Brennan tweeted. “But I have never witnessed the type of reckless partisan behavior I am now seeing from Nunes and House Republicans. Absence of moral and ethical leadership in [White House] is fueling this government crisis.” 
Brennan’s tweet linked to a Washington Post opinion piece written by Rep. Adam SchiffAdam Bennett SchiffHouse Democrats want to silence opposing views, not 'fake news' White House defends not sanctioning Saudi crown prince over Khashoggi What good are the intelligence committees? MORE (Calif.), the top Democrat on the Intel committee, that warns Nunes crossed a “dangerous line” and is increasing “the risk of a constitutional crisis" and another Saturday Night Massacre.
Schiff, on Twitter, accused Nunes of violating committee protocol and giving Trump a “secretly altered” version of the memo. 
The FBI took the unusual step Wednesday of publicly voicing “grave concerns” about the memo being released, raising flags about inaccuracies. The memo purports to show surveillance abuses committed by the FBI. 
Brennan served in the CIA under both the Bush and Obama administrations and has defended the FBI against attacks from Trump before.