As usual, Carol is wrong again. It was Gene Sperling, whoever that is.
“Of course no threat was intended. As Mr. Woodward noted, the email from the aide was sent to apologize for voices being raised in their previous conversation. The note suggested that Mr. Woodward would regret the observation he made regarding the sequester because that observation was inaccurate, nothing more. And Mr. Woodward responded to this aide’s email in a friendly manner.”