From twitter:
He took an oath to respect the Constitution. He must testify before Congress on what he knows about Trump's interference with the election certification.The Select Committee demands info on efforts to send false "alternate electors" and otherwise interfere with election certification.
— January 6th Committee (@January6thCmte) February 15, 2022
The Select Committee issued 6 subpoenas:
•Michael A. Roman
•Gary Michael Brown
•Douglas V. Mastriano
•Laura Cox
•Mark W. Finchem
•Kelli Ward