Perhaps Mr. Khan is practicing law without a license in NY...hmmmmm.
Well he didn’t practice law while in DC
“Khan spent seven years, from 2000 to 2007, in the Washington, D.C., office of then-Hogan & Hartson. He served as the firm’s manager of litigation technology. Although he did not practice law while at Hogan, Khan was well versed in understanding the American courts system. On Thursday night, he described his late son dreaming of becoming a military lawyer.”
http://www.law.com/sites/almstaff/2016/07/29/dnc-speaker-khizr-khan-a-man-of-character-say-former-big-law-colleagues/?slreturn=20160702140609