Can you get it expunged?
Yeah, you need a lawyer, not internet advice.
What's constitutional or not is not relevant to the practical considerations of your case.
“The egg hatched...” “...the egg hatched... and a hundred baby spiders came out...”
“Who are you?” “A friend. I'm here to prevent you from making a mistake.” “You have no idea what I'm doing here, friend.” “In specific terms, no, but I swore an oath to protect the world...”
“It's a goal you won't understand until later. Your job is to make sure he doesn't achieve the goal.”