Classified documents retrieved from former President Donald Trump's Florida residence held top U.S. secrets, officials say. The documents, which the FBI acquired in an Aug. 8 raid of the former president's Mar-a-Lago property, deal with U.S. intelligence information on Iran and China.

At least one of the documents contained details on Iran's missile program, the Washington Post reported. Of the nearly 13,000 documents recovered in the FBI's August raid, 103 were classified, with 18 being top-secret, court papers show.

The collection of documents pertaining to Iran and China is considered the most sensitive in the agency's investigation into Trump's alleged mishandling of classified information as well obstruction and destruction of government records.

The former president has maintained his innocence.

"I declassified the documents when they left the White House. There doesn't have to be a process as I understand it. You're the President of the United States, you can declassify... even by thinking about it," Trump said in an interview with Fox News' Sean Hannity earlier this month.

The former president also in early October, called on Supreme Court Clarence Thomas to block the Justice Department from accessing the Mar-A-Lago documents.

In a separate probe Friday, former president Trump was subpoenaed by the January 6 panel.

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