"Just following orders" didn't work at Nuremberg and it won't work here. Requiring a license changes an inalienable right into a privilege.
Jeanine Pirro needs to go back and study the Constitution. Cut off her government paychecks until she submits a handwritten copy of the Bill of Rights, preferably in cursive, especially the Second Amendment.
The blame rests with Congress who hasn't acted, and a bit on President Trump who has advocated for concealed carry reciprocity but given the acceptance of "prosecutorial discretion" in our system could instruct the Justice Department not to prosecute.
If he does I doubt Pirro will resign in protest, so you'll be arrested by the DC police. This is largely a state/local issue until Congress acts.