Attorneys for the whistleblower who first filed the complaint about President Donald Trump’s July call with the leader of Ukraine defended their client in a statement Wednesday night amid ongoing efforts by the White House to undermine the person’s reputation.

In the statement, attorneys Andrew Bakaj and Mark Zaid wrote that the whistleblower, who remains anonymous, has “never worked for or advised a political candidate, campaign, or party” and said the person’s entire government career has been spent in “apolitical, civil servant positions.” Both the White House and Republican lawmakers have latched on to a Aug. 26 letter written by the intelligence community inspector general, Michael Atkinson, in which he wrote that the whistleblower had “some indicia of an arguable political bias … in favor of a rival political candidate.”

CNN later reported that that “indicia” was that the whistleblower is a registered Democrat, but that news has only inflamed Trump’s efforts to attack the person.

“In light of the ongoing efforts to mischaracterize whistleblower #1’s alleged ‘bias’ in order to detract from the substance of the complaint, we will attempt to clarify some facts,” the pair wrote, later noting that: “The whistleblower is not the story. To date, virtually every substantive allegation has been confirmed by other sources.”