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The whistleblower, and whether or not that person should be identified, has emerged as a rolling point of debate among Republicans.

President Trump and some of his closest allies have called for the whistleblower to come forward publicly, arguing that the president should have the ability to confront his accuser. They also believe publicly identifying the individual would help reveal any potential political biases the person might have.

But calls for the whistleblower to be publicly identified have also drawn fierce pushback from several GOP senators, who note that the whistleblower is protected under federal law.

The House impeachment inquiry is also investigating if Trump tied aid to Ukraine to the country opening up a probe of the Bidens.