It's not.
He was subpoenas to return documents. He didn't do it. His attorney said that everything was returned when it wasn't. So, they sent in a team to recover it, just like would happen to anyone.
How can you say this is a political stunt? The dude refused to return classified docs. It's pretty straight-forward.
It was a political stunt, just like:
In 1973 the Justice department knowing one day Trump would run for president accused Trump of violating the Fair Housing Act.
In 1985 the City of New York, knowing one day Trump would run for president accused Trump of using illegal tactics to evict tenants.
In 1988 the Justice department in its continuing effort do foil Trump's political asperations sued him for anti-Trust violations.
In 2000 New York State Lobbying Commission also joined the witch hunt against future presidential candidate Trump for his illegal lobbying activities.
In 2001 the SEC joined in the attempt to derail Trump's political asperations.
Then in 2003 the Germans even joined the effort to undermine the future prez for political reasons. Maybe that was why he and Angela Markel has such off relations.
In 2013 the NY state atty general sued Trump over his fake university.
All of these were politically motivated to prevent Trump from building his wall.