New Delhi, Feb. 24 -- Donald Trump's new 10% global tariffs went into effect on Tuesday, kicking off a White House effort to preserve the president's trade agenda after the Supreme Court struck down his original sweeping duties.

The president signed an executive order last Friday authorizing the 10% import tax just hours after the ruling. He subsequently threatened to raise the number to 15%, but Trump did not officially issue a directive to increase the rate by Tuesday at 12:01 a.m. Washington time when the 10% levy went into effect.

The White House is working on a formal order that will increase the global tariff rate to 15%, according to an administration official. The timeline for implementing that higher levy has not been finalized...