The Impoundment Act passed with overwhelming bipartisan support in the house and unanimous support in the senate. It was a direct rebuke to Nixon deciding he had the presidential authority to not fund programs he didn't like.
It unambiguously affirmed Congress's sole authority over federal spending.
The Constitution clearly gives Congress the authority over federal taxation and spending, and this power is a key check on executive power. If the executive branch could ignore congressional spending decisions, it would effectively render Congress’s "power of the purse" irrelevant.
It's called the Spending Clause, not the Appropriation Clause, for a reason.
As to the rest of your argument: not spending the full $100M congress specifies in 100M Mars Bars for the Air Force because Mars wasn't able to deliver the last 25 million Mars Bars, is not the same thing as "One person decided Mars Bars are Woke so we just stopped paying Mars Candy yesterday."
It unambiguously affirmed Congress's sole authority over federal spending.
The Constitution clearly gives Congress the authority over federal taxation and spending, and this power is a key check on executive power. If the executive branch could ignore congressional spending decisions, it would effectively render Congress’s "power of the purse" irrelevant.
It's called the Spending Clause, not the Appropriation Clause, for a reason.
As to the rest of your argument: not spending the full $100M congress specifies in 100M Mars Bars for the Air Force because Mars wasn't able to deliver the last 25 million Mars Bars, is not the same thing as "One person decided Mars Bars are Woke so we just stopped paying Mars Candy yesterday."