The whistleblower who filed the complaint alleging President Trump improperly pressured Ukraine to investigate Joe Biden is a registered Democrat, a report said Thursday.

The party registration is the reason why spy chief Joseph Maguire could not say if the whistleblower was biased, CNN reported Thursday.

In his testimony in front of Congress last week, Maguire testified the whistleblower acted “in good faith,” but added he could not say if he was motivated by bias.

The anonymous whistleblower’s attorney dismissed the notion that his client’s party affiliation drove him to come forward with his complaint.

“I understand @jaketapper at @CNN reported my client’s pol bias, as stated in @ODNIgov IG memo, was nothing more than #whistleblower registered Democrat,” attorney Mark Zaid wrote on Twitter.

“We won’t comment on identifying info but if true, give me a break! Bias? Seriously? Most ppl are,” he added.