Hillary Clinton gives her take on Pompeo Ukraine report to Colbert

"I think if the secretary of state was on the call as is now being reported, he should have been one of the very first people to say, 'Wait a minute, we’ve got to clean this up. You can’t let that stand.' But we don’t know what he did."

Clinton also had a dig at Trump lawyer Rudy Giuliani, who's been subpoenaed by the House Intelligence Committee over Ukraine.

• The 2016 Democratic presidential candidate noted that leaders might use an envoy or special adviser to deliver a message that's carefully thought through, but "from what we’ve seen on television, carefully thinking through is not one of Rudy's strong points."

Go deeper: White House release of Ukraine call threatens new precedent