U.S. Secretary of State Mike Pompeo on Tuesday suggested that Ukraine should be investigated over allegations that it interfered in the 2016 election, a debunked theory advanced by President Donald Trump that witnesses told the congressional impeachment inquiry was spread by Russian spy agencies.

Pompeo was asked at a news conference if the United States should probe accusations of Ukrainian election meddling that Trump's fellow Republicans have raised in the Democrat-led U.S. House of Representatives probe into whether Trump abused his power for domestic political gain.

"Any time there is information that indicates that any time any country has messed with American elections, we not only have a right but a duty to make sure that we chase that down," Pompeo replied without naming Ukraine. He added that even a suggestion of interference should be probed.