WASHINGTON, D.C. - Democrats described the moment as a bombshell, but Republicans say they are skeptical. 

In a pivotal moment in the first public hearing as part of the impeachment inquiry into President Donald Trump, Ambassador Bill Taylor told a House committee a staffer told him President Trump told the European Union Ambassador Gordon Sonland on a phone call that he wanted to know more about investigations into the Bidens from Ukraine. 

"The member of my staff could hear President Trump on the phone asking Ambassador Sondland about the investigations," Taylor testified.

The revelation did not move Congressional Republicans. 

"It’s just hard to believe with all of this going forward and everything that has happened, all of a sudden a staffer appears who says 'oh by the way I overheard a phone call,'" said Rep. Brett Guthrie, (R) Bowling Green. "Let’s see where that leads but it seems almost incredible to me that took place," he added, casting doubt on the accuracy of the episode.

In his Washington office Thursday, Guthrie doubled down on the points reiterated by House Republicans. They argue the phone call between President Trump and the leader of Ukraine that sparked the impeachment inquiry showed no evidence of pressure from Trump and that the foreign aid in question was ultimately released.

"Until they show there is a quid pro quo or evidence or extortion or bribery with the Ukraine for aid, you can have all of this noise but unless the Ukrainian president says there was a quid pro quo, which he has denied and there's been no evidence to say it, I don't think it will have an impact," said Guthrie.

"We have very serious non-partisan diplomats who were very much concerned about an unprecedented abuse of power on behalf of the President of the United States," said Rep. John Yarmuth, (D) Louisville.

Yarmuth says he's confident the weight of all of the public testimony combined will shift public opinion against Trump when the Judiciary Committee debates and marks up the articles of impeachment on the House floor. 

"What we will find there was that it was not just this one phone call that was the problem. There will be a multitude of impeachable offenses that will be discussed at that time and if there is going to be a shift in public opinion, that's when you will see it," said Yarmuth.