Jofi Joseph served as non-proliferation director at the National Security Council and was involved in nuclear negotiations with Iran. In a statement to Politico, Joseph says he takes "complete responsibility" for the natsecwonk Twitter account, which often criticized administration policies and top officials.
Joseph says the Twitter feed started as a "parody account." He apologized to those he insulted.
A White House official confirmed that Joseph is no longer working for the administration, but would not comment on personnel matters.
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