WASHINGTON — The fallout from President Donald Trump’s aggressive new tariffs has spurred Congress into action, with a growing number of Republicans joining Democrats to express interest in using their power to restrain him.

After the GOP-led Senate delivered a rare rebuke to Trump on Wednesday by voting to undo his tariffs on Canada, lawmakers in both chambers are weighing additional steps to rein him in. Senators are eyeing other mechanisms to rescind Trump’s existing tariffs while…