(CNN) The White House budget office's first official action to withhold $250 million in Pentagon aid to Ukraine came on the evening of July 25, the same day President Donald Trump and Ukrainian President Volodymyr Zelensky spoke on the phone, according to a House Budget Committee summary of the office's documents.

That withholding letter, which was among documents provided to the committee, was signed by a career Office of Management and Budget official, the summary states. But the next month, OMB political appointee Michael Duffey signed letters taking over the decision to withhold both the Pentagon and State Department aid to Ukraine from the career official.

A hold was placed on the Ukraine aid at the beginning of July, and the agencies were notified at a July 18 meeting that it had been frozen at the direction of the President, a week before the Trump-Zelensky call.

The career official who initially withheld the aid money was Mark Sandy, according to a source familiar with the matter. Sandy testified before House impeachment investigators in a closed-door deposition, while Duffey defied a subpoena.

Mark Sandy, a senior career official at the Office of Management and Budget, arrives earlier this month to the US Capitol for a closed door deposition with lawmakers.

The documents to the House Budget Committee provide additional insight into the actions going on inside the White House's budget office to hold up the US aid to Ukraine, a key part of the House Democrats' impeachment inquiry. The committee only received a partial production of documents, which are separate from the impeachment inquiry, and it's unclear what the significance is that the money was officially withheld on the same day as the July 25 call.

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