Congress has recognized, of course, that presidents may have valuable ideas regarding administrative organization. Beginning in 1939, Congress enacted a series of so-called Reorganization Acts, which gave presidents significant (but not unlimited) discretion to create, abolish, or restructure administrative agencies, subject to an important caveat. Presidential reorganization plans were subject to a “legislative veto”—that is, a resolution disapproving the plan enacted by both Houses of Congress, which could keep it from going into effect. This would be a concurrent resolution of the House and the Senate that the president could not veto and did not have to sign in order to make it binding. Through the threat of legislative vetoes, Congress kept control over what got created, abolished, or restructured.
In 1983, however, the Supreme Court held that legislative vetoes were an unconstitutional form of legislation. As a result, Congress took away presidential authority to implement reorganizations unilaterally. If presidential reorganization plans could not easily be blocked, Congress would no longer authorize them. Since 1984, presidents have been allowed only to propose reorganizations, which Congress could enact or reject through the ordinary legislative process. (A suggestion in 2023 by Vivek Ramaswamy that a 1977 Reorganization Act continues to empower presidents to abolish agencies despite the statutory changes Congress enacted in 1984 is an appallingly fanciful statutory interpretation.)
In light of this legal background, the question is why Trump thinks a president can legally disassemble agencies on his own—assuming, that is, that he cares if it is legal. The likely answer would involve an especially ambitious version of an Article II interpretation called the “unitary executive theory.” The baseline premise of the unitary executive theory is that Article II guarantees presidents complete removal authority over every subordinate member of the executive branch. Bolder versions contend that he or she can also directly command how every function of the executive branch be performed—or even perform them personally.