US dollar weakens as Supreme Court strikes down tariffs while Iran tensions mount
The US dollar weakened on Monday after the Supreme Court struck down trade tariffs. Traders are also weighing rising Iran tensions and volatility in Mexico.
The U.S. 
US Supreme Court struck down President Donald Trump’s tariffs on February 23, 2026, ruling that the administration’s use of Section 122 (1977 emergency law) exceeded presidential authority. Chief Justice John Roberts delivered the decision, which immediately affected markets as the dollar weakened and traders in the forex market began to reevaluate U.S. tariff policy.
US Supreme Court struck down President Donald Trump’s tariffs on February 23, 2026, ruling that the administration’s use of Section 122 (1977 emergency law) exceeded presidential authority. Chief Justice John Roberts delivered the decision, which immediately affected markets as the dollar weakened and traders in the forex market began to reevaluate U.S. tariff policy.
