The power of the eternal purse

I knew progressives would be unhappy with the rescission bill, but I didn't understand that they would consider it a reversal of the constitutional order:

Our Constitution gives Congress the ‘power of the purse’ for a reason. It ensures federal spending is controlled by people’s elected representatives, not an all-powerful executive. It’s a crucial check against the expansion of presidential power.

This rescissions bill fundamentally alters that balance.

Republicans, including President Trump, enacted a funding bill that included this money for foreign aid and public broadcasting only months ago. Then they reversed course and voted to cut those programs. By walking back those commitments, congressional Republicans showed, yet again, they will refuse to stand up to President Trump, even for things they support.

This seems off-base. If Congress can approve spending, why shouldn't it also be able to cancel it? The real rub seems to be that rescission operates like a delayed line-item veto, which undermines the ability to approve spending favored by only one party by holding hostage spending critical to the other party.

Now there is much wailing over the fact that Congressional factions can no longer count on spending "deals" to be binding. There is more talk than I can ever before remember hearing about Democrats' shutting down the government. I'm not sure how effective a strategy that is, since the party in power can designate essential spending to survive, which is not a power I'd want to give to the DOGE factions if I were leading the Dems in Congress.