Republicans seek whistleblower's identity in U.S. impeachment inquiry

The skirmish revealed a growing dispute between the two sides, as Republicans say they need to hear from the intelligence official who initially raised the alarm over Trump's attempts to get Ukraine to investigate his political rivals in order to assess the whistleblower's credibility.Democrats say the whistleblower's testimony is not needed at this point because it has been corroborated by other witnesses.Bringing him or her forward after repeated attacks by Trump would only put the whistleblow