WATCH: Dick Cheney Attacks Trump For His Daughter

In a new video ad Former Vice President Dick Cheney calls former President Donald Trump a "coward."

He then goes on to call his daughter, Rep. Liz Cheney of Wyoming, "fearless."

'In our nation’s 246-year history, there has never been an individual who is a greater threat to our republic than Donald Trump. He tried to steal the last election using lies and violence to keep himself in power after the voters had rejected him,' Dick Cheney says in the ad.

'He is a coward. A real man wouldn't lie to his supporters. He lost his election and he lost big. I know it, he knows it and deep down I think most Republicans know it,'

Liz Cheney was the most senior of the 10 House Republicans who voted to impeach Trump on a charge of inciting the Jan. 6, 2021, storming of the U.S. Capitol. She then joined the January 6th investigative committee, led by Democrats.

Here is the actual ad.

Since then her chance of winning re-election in Wyoming, a state that voted for Trump more than any other state, is slim.

Trump, stepping up his efforts to oust Cheney from Congress, endorsed Harriet Hageman.

Cheney’s campaign tells Fox News the new ad will run statewide in Wyoming on TV and on digital and streaming platforms and is backed by a six-figure buy.

Liz Cheney has made appearances in Wyoming since then. But only in private meetings with what supporters she has in the state.

She is not making any appearances on radio shows like my own, which is heard on stations across Wyoming.

She has been willing to appear on some national television shows.

On a couple of recent Sunday talk show appearances she said:

'I am working hard to earn every single vote,' Cheney said in an interview on Fox News Sunday. But she emphasized, 'Given the choice between maintaining my seat in the House of Representatives on the one hand or ensuring the survival of our constitutional republic and ensuring the American people know the truth about Donald Trump, I will choose the Constitution and the truth every day of the week and twice on Sunday.'

Hageman campaign adviser Tim Murtaugh said in a statement to Fox News that:

'Liz Cheney should drop the pretense that she’s running for re-election. She’s been raising money from Democrats in California and New York for months for her fever dream of running for president.'

'Voters know that she’s abandoned her job of representing Wyoming and instead is pursuing her own personal war with Donald Trump,' Murtaugh claimed. 'It’s why people are fed up with her, and this ad just reinforces that point. This ad will raise more dollars from Democrats, but in a Republican race in Wyoming it just reminds people why they’re voting for Harriet Hageman.'