Trump White House lawyer Eric Herschmann, who pushed back on efforts by the former President and his allies to overturn the 2020 election, has been subpoenaed by a federal grand jury investigating the events surrounding January 6, 2021, a person familiar with the probe confirmed to CNN.

(SOURCE) https://www.cnn.com/2022/08/15/politics/eric-herschmann-subpoena-grand-jury-investigation/index.html