(CNN) The White House is withdrawing the nomination of Elaine McCusker to be the Pentagon's comptroller, according to a White House official.

McCusker was the Pentagon's acting comptroller who raised concerns about the legality of Ukraine military aid being held by the Trump administration

McCusker's name -- and qualms about the aid -- have appeared in correspondence between government officials.. CNN previously reported that on September 5, McCusker mentioned the "increasing risk of execution," a nod to concerns at the Pentagon that continuing the hold could prevent all the money from being spent.

Finally, on the evening of September 11, Michael Duffey, associate director of national security programs at the Office of Management and Budget, alerted McCusker that he was releasing the money for Ukraine.

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