Ok, is this what his letter in my post above is referring to?
In the Impoundment Control Act, under “Deferrals”:
Deferrals
The ICA defines a “deferral” as withholding, delaying, or – through other Executive action or inaction – effectively precluding funding from being obligated or spent. The ICA prescribes three narrow circumstances in which the President may propose to defer funding for a program: (1) providing for contingencies; (2) achieving budgetary savings made possible through improved operational efficiency; and (3) as specifically provided by law.
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Did he just claim a deferral in the letter above?