WASHINGTON (AP) — Seven senators are visiting the U.S. detention center at Guantanamo Bay on Friday on a fact-finding oversight trip.

The senators plan to review detainee facilities and the legal status of individual detainees. They also will review the military commissions process under which detainees are tried.

There are roughly 150 detainees at Guantanamo.

The Obama administration has pledged to keep trying to close the facility, which opened in January 2002.