House Speaker Nancy Pelosi announced Thursday that Rep. Liz Cheney (R-Wyo.) would serve on the House committee investigating the Donald Trump -inspired attack on the U.S. Capitol earlier this year.

We are very honored and proud she has agreed to serve on the committee, Pelosi said at a press conference announcing the committee members.

Pelosi said Jan. 6 when a violent mob of Trump supporters attacked the U.S. Capitol in an attempt to stop the certification of election results, injuring law enforcement officers and defacing the building was one of the darkest days in our nations history. Five people died as a result of the riot.

Cheney was the only Republican selected by Pelosi to serve on the special committee, alongside seven Democratic House lawmakers.

Those who are responsible for the attack need to be held accountable and this select committee will fulfill that responsibility in a professional, expeditious and non-partisan manner, Cheney said about joining the committee. Our oath to the Constitution, our commitment to the rule of law, and preservation of the peaceful transfer of power must always be above partisan politics.