Mastriano is an ally of former President Donald Trump and supported his post-election efforts to contest the 2020 results in Pennsylvania. Trump and attorney Rudy Giuliani both later backed Mastriano in the competitive Republican gubernatorial primary.
The select committee subpoenaed him for documents and testimony on Feb. 15. Three months later, on May 17, he won the Republican primary. And just a few weeks after that, he produced a tranche…