The

crowd chanted 

"Lock him up!" 

as he left the courtroom.

“The fact that Flynn was charged with, and is pleading guilty to, such a minor crime, suggests a bombshell of a deal with prosecutors," said Cornell Law Vice Dean Jens Ohlin. 

"If this is the entirety of the plea deal, the best explanation for why Mueller would agree to it is that Flynn has something very valuable to offer in exchange: damaging testimony on someone else," Ohlin said.

Flynn pleads guilt to lying to the FBI