Nearly 200 Democratic lawmakers have filed a legal brief supporting a lawsuit against the Trump administration’s use of emergency powers to impose tariffs.

The brief bolsters a group of small businesses and Democratic-led states suing to block President Trump’s tariffs imposed under the International Emergency Economic Powers Act (IEEPA) in advance of appeal arguments later this month.

Sen. Jeanne Shaheen (D-N.H.), the ranking member of the Senate Foreign Relations Committee, led 28 Democratic senators and 162 House Democrats in the filing, calling the president’s use of IEEPA an “unlawful abuse of emergency powers.”

“The President’s reckless tariff agenda has caused economic chaos and raised prices for families and businesses across the country at a moment in which the cost of........

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