"And security experts warn that the commander in chief’s frequent visits — four since he took office in January — afford an unprecedented opportunity for eavesdropping and building dossiers on the president’s routines and habits, as well as those of the inner circle around him. They add that with each repeat visit, the security risk escalates.
“The president is the biggest, richest intelligence target in the world, and there is almost no limit to the energy and money an adversary will spend to get at him,” said David Kris, a former Obama-era assistant attorney general for national security.
Former Secret Service agents said the setup at Mar-a-Lago and the president’s other regular clubs presents challenges that their agency wasn’t built to deal with. The Service’s main job is to protect the president from physical threats and monitoring for wiretaps and other listening devices — but not from the kinds of counterespionage challenges presented by the president’s choice to eat, sleep and work at a club accessible to anyone who can get a member to invite them in."