WASHINGTON :Republican U.S. Senator Marsha Blackburn wants the CEOs of AT&T, Verizon and T-Mobile to disclose whether they received or objected to subpoenas for phone data from eight U.S. senators related to a probe of the January 6, 2021 Capitol riot, according to letters seen by Reuters on Friday. On Monday, Senate Republicans disclosed a 2023 document that showed the FBI obtained phone data known as "toll records" from senators' phones, including Blackburn, tied to the U.S. Justice