This goes right back to his first impeachment where we got a clear lesson on this. Congress authorized money for the defense of Ukraine. It went through multiple mandatory controls with DoD and other agencies to ensure the specific disbursement was likely to reach it's intended target. Those controls could have triggered impoundment if they found any flaws, but they did not. Then it was stopped by the president expressly to extort a political favor from Ukraine. In this case, the House voted to impeach and the Senate refused to convict likely due to political loyalty. Now that he knows Congress likely won't stop him, he can abuse his authority as he pleases.
The Train decision came nearly 200 years after Article 1 was written, and during that time impoundment was practiced by Presidents beginning with Thomas Jefferson. Overturning Train would in fact restore the original meaning of Article 1.
If you disagree, please type the words: "The President can unilaterally disband a federal agency empowered by Congress whenever he wants for whatever reason he wants and no one can stop him". Because that is what you are implying.
You know what else the founders definitely did not envision? A standing federal army. Trump is honor bound to the soul of George Washington to disband the DoD and reclaim $800B. Surely that is 100% his prerogative and nobody has any right to stop him.
I'm afraid that's just factually wrong. What Trump and Musk are doing is called impoundment of appropriated funds[1] and it is Constitutional and consistent with the separation of powers, and was in fact considered one of the powers of the President until 1974.
In 1974, Congress passed the Impoundment Control Act, making it illegal (but not unconstitutional), and that will no doubt be fought in the Courts, but it seems likely the the current Supreme Court will overturn the act, making what Trump and Musk are doing legal.
1: https://en.wikipedia.org/wiki/Impoundment_of_appropriated_fu...