Trump didn't need congress to slap tariffs on all imports. Yet he made deals that removed most immediately before they could take effect & nearly all of them by election time.
Republicans were the ones working to get tariff powers back from president
To limit tariffs under Section 232. Senator Pat Toomey (R-PA), and Senator Rob Portman (R-OH) proposed competing bills. Senator Toomey’s bill requires congressional approval for all tariffs imposed under Section 232, while Senator Portman’s bill adds more steps to the process of the President enacting Section 232 tariffs.4
Senate Finance Committee Chairman Chuck Grassley (R-IA) has been one of the strongest proponents of reclaiming Congress’s power to impose tariffs. After reviewing Senator Toomey’s and Senator Portman’s proposals, he has suggested that any tariff imposed under Section 232 should require the approval of Congress to continue the tariff after a certain period of time. Senator Grassley’s proposal also requires the executive branch to report on how 232 tariffs are protecting against national security threats.
On January 23, 2019 Rep. Warren Davidson (R-OH-8) introduced H.R. 723, The Global Trade Accountability Act, “to provide for congressional review of the imposition of duties and other trade measures by the executive branch, and for other purposes.” This would transfer some authority back to Congress in the realm of international trade.