Biden used executive authority on tariffs repeatedly, the same method Trump is using. And you're totally incorrect, Biden maintained the existing IEEPA tariffs on China that were imposed in Trump's first term.
As far as I'm aware, Trump's first term tariffs on China were Section 301 tariffs, and even though he floated the idea of IEEPA tariffs, he never actually invoked IEEPA in his first term [1]. Every article I can find about Biden extending and/or increasing Trump's China tariffs that mentions the legal authorization says it's under Section 301 of the 1974 act [2, 3, 4]. If you're aware of any evidence to the contrary, please share.
Not repealing an action isn’t the same as supporting it. It doesn’t make sense to arbitrarily repeal tariffs without a coordinated draw down of tbr other party.
You're literally replying to a comment putting in a great detail which statues were used in case of Trump tariffs this time and in case of Biden tariffs (and Trump to the extent) last time. Just saying "this is executive authority on tariffs" doesn't equate these usages, it is important what laws does this authority rely on.