WASHINGTON (AP) – Pennsylvania Democratic Sen. John Fetterman is in Walter Reed National Military Medical Center to seek treatment for clinical depression. His office said Thursday that Fetterman checked himself in Wednesday night. Fetterman continues to struggle with the aftereffects of a stroke he suffered last May. His chief of staff, Adam Jentleson, says Fetterman has experienced depression off and on throughout his life, but it became severe in recent weeks. The 53-year-old Fetterman is in his first weeks as a U.S. senator after winning the seat held by now-retired Republican Pat Toomey. Last week, Fetterman stayed two days in George Washington University, checking himself in after becoming lightheaded.