WASHINGTON — Virginia Thomas, the wife of Justice Clarence Thomas and a conservative activist who pushed to overturn the 2020 election, told the House committee investigating the Jan. 6 attack on the Capitol that she never discussed those efforts with her husband, during a closed-door interview in which she continued to perpetuate the false claim that the election was stolen.

Leaving the interview, which took place at an office building near the Capitol and lasted about four hours, Ms. Thomas smiled in response to reporters’ questions, but declined to answer any publicly.