Buttigieg on impeachment: Bolton should testify

Democratic presidential candidate Pete Buttigieg says John Bolton "ought to testify" at President Donald Trump's impeachment trial. Buttigieg told reporters following a campaign event in Boone, Iowa, on Monday that Bolton, Trump's former national security adviser, "clearly has something important to contribute."

Bolton writes in a forthcoming book that Trump told him that he wanted to withhold hundreds of millions of dollars in security aid from Ukraine until it helped him with politically charged investigations, including into Democratic rival Joe Biden. Trump's legal team has repeatedly insisted that the president never tied the suspension of military assistance to the country to investigations that he wanted into Biden and his son.

The account has given Democrats new fuel in their pursuit of sworn testimony from Bolton and other witnesses, a question expected to be taken up later this week by the Republican-led Senate.

Buttigieg was making a number of stops across Iowa on Monday, one week before the state's first-in-the-nation caucuses.