Poking fun at current events...
Hardly "unannounced", he was quietly served beforehand.....
They also tried to get the documents for months by other means. Trump just mostly ignored their efforts. It's as if he wanted them to raid his home so he could once again play victim, when once again he i sonly suffering the consequences of his own actions. He took top secret classified nuclear secrets to florida, and they were found in an unlocked basement storage area. That, by any definitions is mishandling of classified documents.
Ironically, hoping to catch Hillary with classified emails, Trump increased the penalties for mishandling classified materials from one to five years i prison, and he may find himself prosecuted under a law that he himself signed.