In a May 2017 testimony to congress former Deputy Attorney General Sally Yates explains the details surrounding her engagement with White House legal counsel Don McGahn. However, for the purposes of truthful discussion, the important part of the back-and-forth between Senator Graham, Sally Yates and former DNI James Clapper is not the aspect about Flynn or McGahn.
Listen carefully to the first three minutes; specifically the part about the Flynn transcript leak to the Washington Post. Notice Graham outlining how easy it would be for the intelligence apparatus to find out who: (A) unmasked the Flynn communication; and (B) likely then leaked the Flynn communication. Pay close attention:
http://theconservativetreehouse.com/2018/12/05/senator-graham-explains-how-easy-it-would-be-for-fbi-and-doj-to-find-flynn-leaker/

Realist - Everybody in America is soft, and hates conflict. The cure for this, both in politics and social life, is the same -- hardihood. Give them raw truth.