He might threaten, but he wouldn’t dare stop SS/Medicare.
The Gray Panthers would claw him relentlessly. He would be losing the AARP’s supposed 40 million membership.
That would be disaster for his reelection [assuming he is not forced by the Dem Party to step aside early next year].
Take the 39 billion a month this article says remains. Add to it the total cash from all the cuts of departments, agencies, duplicative programs, and efficiencies.
Pay military operational expenses.
Then give a share of the total cash now remaining to each surviving department based on its previous percentage of the total budget.
Tell them to live with it or close shop.
You have just balanced the budget.