Trump supporters protest the execution of a search warrant against the former president outside Mar-a-Lago and FBI headquarters

• Trump supporters gathered outside Mar-a-Lago and FBI headquarters in protest Monday night.

• The FBI executed a search warrant against the former president, taking documents from the residence.

• ABC News reported the search was related to potentially classified documents Trump took from the White House.

After the FBI executed a search warrant on Donald Trump's residence at Mar-a-Lago on Monday, supporters of the former president gathered outside the Florida resort and FBI headquarters to protest.

Though it was initially unclear which of several pending investigations into the former president the warrant was related to, ABC News cited sources saying it was in connection to 15 boxes of potentially classified documents Trump took with him from the White House to Mar-a-Lago at the end of his presidency.

The former president quickly took to social media following the execution of the warrant to decry the legal search, calling it "prosecutorial misconduct."

"Nothing like this has ever happened to a President of the United States before," Trump's statement read. "After working and cooperating with the relevant Government agencies, this unannounced raid on my home was not necessary or appropriate."

Followers of the ex-president gathered outside his Palm Beach, Florida, golf club to protest the search, holding signs and shouting obscenities.

Supporters were also summoned to gather in front of FBI office locations in Palm Beach, as well as Phoenix, Arizona, and Washington, DC, by alt-right organizers.

Though organizers called for the gatherings to be peaceful protests, posts from supporters on Twitter and Truth Social included calls for retaliation against the FBI. Some users called the federal investigators a "terrorist organization" while others asked the former president to "announce the revolution" in rhetoric similar to that seen prior to the Jan. 6 attack on the Capitol.

The FBI, DOJ, and National Archives and Records Administration did not immediately respond to Insider's request for comment.

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