Verizon wrote back that it generally keeps legal process on file for four years and had no records predating October 2019. Congress didn't learn the subpoena existed until 2025, when Verizon told Grassley's office the 2023 omission came down to "human error." Two of the numbers swept up in that May 2023 subpoena weren't just any senators' lines - they belonged to the Senate Sergeant-at-Arms. Grassley's letter effectively asks how a contractually mandated notification simply never happened. Notably, Verizon complied with Smith's subpoenas while AT&T pushed back - a contrast Senate Judiciary Republicans have highlighted approvingly.