You think this was political somehow? No, he was waiting for an excuse to finally live out his fantasy of getting to operate the beep-boop hissy fire machines on the other side of counter. I bet he fell out of his chair and almost choked on a McNug in excitement when Harris mentioned working at McDonald's.
As someone who worked in kitchens for 10 years, I can tell you it's overrated. He should be thankful that the workers and the secret service and whoever didn't let him get in too deep and end up with 3rd degree grease burns and 1 or 2 fewer digits...or screw up any *real* orders for actual customers.