US President Donald Trump and North Korean leader Kim Jong-un at their second summit in Hanoi in February, 2019. (Photo: AFP)

In an interview with radio station WHP 580 on Monday, Pompeo said it is difficult to know the timing of a third US-North Korea summit but said it is in America’s interest to resolve things as quickly as possible. He said the two leaders can achieve a substantive first step or a substantive big step along the path to denuclearization on the Korean Peninsula.

Their second summit in February in Hanoi ended without a deal after Trump refused to lift sanctions until North Korea takes significant steps to denuclearize.