Video clips showed a party-like atmosphere, with most of the demonstrators holding signs and flags.
It comes as the FBI and Department of Homeland Security issued a joint intelligence bulletin warning of a spike in threats to federal law enforcement officials since the raid.
The bulletin calls on officials to be aware of issues surrounding domestic violent extremists, past and present incidents as well as past behaviors.
The FBI searched the Mar-a-Lago resort for most of last Monday and confirmed that the search warrant was connected to the National Archives.
Today senior republicans are defending the FBI, with the Governor of Arkansas calling on Republican supporters to get behind the FBI.
Mr Trump, his allies, some Republicans in Congress and many conservative pundits have responded with anger directed at the FBI and officials involved in the investigation.
