Send the federal marshals. Hand pick the ones that hate the FBI to send. Seize everything in sight.
If you opened that up to any federal agent and allowed them to assist the Marshal’s for something like that, there’d be a line across DC wanting to get inside that building. In the world of federal law enforcement, there are a lot of egos. None bigger than the FBI. And for that, they tend not to be liked very much. And they’re down right hated by real cops and deputy’s all over the country.