Former President Donald Trump takes the stage at the Conservative Political Action Conference (CPAC) on August 6, 2022 in Dallas, Texas.

Monday's FBI search of Donald Trump's Mar-a-Lago estate makes one thing clear: The legal landscape around the former president is tightening even as he considers whether to run for president again in 2024.

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"My beautiful home, Mar-a-Lago, in Palm Beach, Florida, is currently under siege, raided and occupied by a large group of FBI agents," Trump posted on his preferred social network, Truth Social, on Monday evening.

It wasn't immediately clear what the FBI was after -- or, specifically, what the agents were looking for. Boxes of items were taken during the search, a source familiar with the investigation told CNN.

We do know that federal investigators issued a subpoena to the National Archives and Records Administration in May seeking access to classified documents taken to Trump's home in Florida.

Earlier this year, 15 White House boxes that Trump brought to Mar-a-Lago were recovered and returned to the National Archives. Among the returned boxes were letters from North Korean dictator Kim Jong Un and former President Barack Obama.