Gen. Gregory Guillot, commander of the North American Aerospace Defense Command and U.S. Northern Command, attributed the surge of more than 20 airspace violations near President Donald Trump‘s Mar-a-Lago estate to civilian pilots, urging better adherence to flight restrictions.

NORAD, which is tasked with monitoring and defending North American airspace, has expressed growing concerns over the “excessive” number of airspace violations near Mar-a-Lago since Trump’s second presidency began in January.