The Social Security Administration official who alleged in a whistleblower complaint that the Department of Government Efficiency had put the personal data of millions of Americans on a vulnerable server said in an email Friday that he's submitting his "involuntary resignation" because of actions the agency has taken against him. Charles Borges, who'd been the SSA's chief data officer, said in an email to colleagues — which was obtained by NBC News from a person who received it — that he had experienced retaliation since his whistleblower complaint became public.

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