This 'reinvigorated' doctrine could be used to challenge Trump's tariffs
Briefly

The ability to challenge President Trump's tariffs stems from the 'major questions doctrine', which insists that Congress must clearly authorize significant economic decisions made by executive agencies. Legal experts argue that the use of the International Emergency Economic Powers Act (IEEPA) by Trump to impose tariffs may clash with this doctrine. Supreme Court precedents have recently revitalized this doctrine, affecting decisions on federal powers. However, experts suggest the challenge to Trump's tariffs may not be straightforward due to the complexities involved.
"Under the major questions doctrine, Congress must 'speak clearly' when authorizing an executive branch agency to make decisions of vast economic and political significance."
"The major questions doctrine has been 'reinvigorated' by the U.S. Supreme Court in striking down the federal eviction moratorium and vaccine mandates imposed during the COVID-19 pandemic."
Read at ABA Journal
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