As president, Trump sometimes shared information, regardless of its sensitivity. Early in his presidency, he spontaneously gave highly classified information to Russia’s foreign minister about a planned Islamic State operation while he was in the Oval Office, U.S. officials said at the time.

But it was at Mar-a-Lago, where well-heeled members and guests attended weddings and fundraising dinners and frolicked on a breezy ocean patio, that U.S. intelligence seemed especially at risk.

The Secret Service said when Trump was president that it does not determine who is granted access to the club, but does do physical screenings to make sure no one brings in prohibited items, and further screening for guests in proximity to the president and other protectees.

The Justice Department’s search warrant raises concerns about national security, said former DOJ official Mary McCord.

“Clearly they thought it was very serious to get these materials back into secured space,” McCord said. “Even just retention of highly classified documents in improper storage – particularly given Mar-a-Lago, the foreign visitors there and others who might have connections with foreign governments and foreign agents – creates a significant national security threat.”