Cooper's segment, titled "There's something about a dictator," detailed the president's concerning rapport with the world's most controversial leaders.
"I sat on that stage between Bernie and John McCain, and John McCain kept reciting to me names of dictators during that speech because he knew more than any of us what we were facing as a nation," Klobuchar said.
"A focus on personal relationships is important, but it has to be coupled with a hard-nosed business of diplomacy," said William Burns, a former deputy secretary of state.
Without mentioning him by name, the former Texas congressman took a swipe at President Donald Trump's relationship with foreign adversaries, like North Korean Dictator Kim Jong-Un and Russian President Vladimir Putin.
Trump's admiration of South Asian strongmen breaks with diplomatic precedent at a time when his administration is challenging traditional alliances.
The president's "insatiable admiration for strongmen" has had dangerous implications outside the U.S., Human Rights Watch says.
Jailing journalists for "false news" rose to a new record in 2017.
He did a deal with the Kurds, cozied up to African despots and befriended Putin.