SAN FRANCISCO, April 15 : U.S. Democratic Senator Elizabeth Warren sent a letter to the U.S. secretaries of the Department of Energy and Department of Defense on Tuesday, questioning them about Nvidia's acquisition of SchedMD, which makes Slurm software. Warren's letter to Energy Department Secretary Chris Wright and Defense Department Secretary Pete Hegseth expressed worries about Nvidia's acquisition of SchedMD and requested "information about the government's dependency on NVIDIA hardware