Ever mindful of how bad it was to live under a king and therefore fearful of granting the new nation’s chief executive too much power, our Founding Fathers gave to Congress, not to the president, its two greatest powers, found in Article I of the Constitution: the power to declare war; and the power to decide and control federal spending.

Neither exists anymore. Congress surrendered its power to declare war in 1950, when President Truman, without consulting Congress, sent U.S. troops to the Korean peninsula to repel North Korea’s attack on South Korea. And Congress surrendered its “power of the purse” last week, when only three Democrats — two senators and one House member — voted for final passage of the GOP budget act, giving President Trump and Elon Musk almost blanket authority over all federal spending.

Senate Minority Leader Chuck Schumer (D-N.Y.) infuriated many of his........

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