Speaking of the Republican former member of Congress from Wyoming, who is a frequent critic, Trump said, “She's a radical war hawk. Let's put her with a rifle standing there with nine barrels shooting at her.

Arizona's attorney general opened a probe into Trump's comments but some legal scholars said he clearly hadn't threatened Cheney.

The pressure on her father to voice his endorsement is increasing. During a live interview that aired Friday on The New Yorker Radio Hour podcast, Liz Cheney said, “I can’t explain why George W. Bush hasn’t spoken out, but I think it’s time, and I wish that he would.”