Liz Cheney on stopping Trump, Pence testifying on Jan. 6: 'This Week' exclusive

GOP Rep. Liz Cheney, once a rising star in the Republican Party and considered a potential speaker of the House, told ABC News Chief Washington Correspondent Jonathan Karl she has no regrets about her political career, including her landslide primary election loss in Wyoming on Tuesday, saying she is now laser-focused on keeping Donald Trump out of the White House.

In an exclusive wide-ranging interview for ABC's "This Week," Cheney also discussed the FBI search at the former president's Mar-a-Lago estate – calling the investigation a very serious development and saying she is "ashamed" at some of her Republican colleagues who have attacked the Justice Department and the FBI.

Cheney, who serves as vice chair of the Jan. 6 Select Committee investigating the Capitol attack -- and speaking with Karl in the committee hearing room -- also said she still hopes former Vice President Mike Pence testifies before the panel in the near future, adding that conversations with his legal team are ongoing.