President Trump’s main dispute with David Holmes’ testimony in which he said that “he overheard” the president speaking loudly over a cell phone (that was not on speaker at the time) is that it simply is not possible. It is certainly not possible for Holmes to have heard Trump’s voice in the detail and clarity that he has claimed.

On a recent broadcast, CNN host Chris Cuomo attempted to prove the president wrong, by demonstrating live on the air that it was indeed possible, and much to his chagrin his stunt severely backfired.

David Holmes, the political counsel at the U.S. Embassy in Ukraine, testified during the impeachment hearing that he overheard a would-be damning phone call between Trump and European Union Ambassador Gordon Sondland. Holmes said he “could hear the president’s voice through the earpiece of the phone,” which was not on speakerphone.

Trump, in real-time, tweeted his skepticism. “I have been watching people making phone calls my entire life. My hearing is, and has been, great. Never have I been watching a person making a call, which was not on speakerphone, and been able to hear or understand a conversation. I’ve even tried, but to no avail,” Trump tweeted. “Try it live!”

Cuomo took the president upon the challenge and called his mother during coverage of the impeachment hearing. “Let’s just play with that for a second. Mom, can you hear me?” Cuomo asked, without receiving a response from his mother.

“I’m with Dana Bash… can you just say hello? Mom? She probably can’t hear me,” Cuomo said as he struggled to hear whether or not his mother could hear him.

Cuomo then put the device on speakerphone.

“Mom, can you hear me?” he asked again.

“I hear you, when you talk to me I hear you,” his mother responded.

The “Cuomo Prime Time” namesake then turned off speakerphone and could no longer hear his mother — just as Trump explained is typically the case.

A frustrated Cuomo then hung up the phone and critics quickly lampooned the moment.

“CNN’s Cuomo trying to prove you can hear a conversation on another person’s cell phone (while not on speaker, mind you) is the most ill-advised thing we’ve witnessed on live TV since Marcia Clark had OJ try the gloves on,” The Hill media reporter Joe Concha wrote.