Several Senate Democrats want to know if the Secret Service is running background checks on visitors to President Donald Trump’s Mar-a-Lago resort.

The eight Democrats led by Sheldon Whitehouse of Rhode Island are asking Secret Service Deputy Director William J. Callahan about the procedures in place at Trump properties when the president is there and apparently conducting business.

The Democrats ask if the Workers and Visitors Entry System, or WAVES, is being implemented at the resort in Palm Beach, Florida, or at other properties like Trump Tower in New York City.

Visitors to the White House are, as a matter of routine, required to provide personal information including birthdates and birthplaces, as well as Social Security or foreign ID numbers before getting access to the building and grounds.

“If not, what other steps are being taken to conduct background checks [on] people who will be present during President Trump’s trips to Mar-a-Lago?” the senators wrote in a list of questions for the Secret Service. “Is the Secret Service considering extending these systems, or any other security screenings, for Trump Tower, Bedminster, or other Trump properties at which the president may spend time conducting official businesses? If not, why not?”