The House panel investigating the U.S. Capitol insurrection met briefly with Doug Mastriano, Pennsylvania’s Republican nominee for governor, on Aug. 9 as it probes former President Donald Trump’s efforts to overturn the 2020 presidential election.

Mastriano, who was outside the Capitol on Jan. 6, 2021, and helped organize efforts in Pennsylvania to submit alternate presidential electors beholden to Trump, cut his interview short without answering questions. He disputed the validity of the committee and the terms of the appearance, his attorney said.