There is still uncertainty about what prompted the attack at Donald Trump's Mar-a-Lago golf club in Palm Beach, Florida.
Neither the FBI nor the US Department of Justice have yet commented on the incident.
According to information provided to the Washington Post, the crackdown was linked to an ongoing investigation into possible improper handling of classified documents.
In January of this year, Trump was forced to send back 15 boxes of documents to the US National Archives, which later confirmed that they had found classified material in the boxes.
See a summary of what happened in the video above.