Jerome H. Powell, the chair of the Federal Reserve, will attend the oral arguments at the Supreme Court on Wednesday over whether President Trump has the authority to remove Lisa D. Cook, a governor at the central bank, according to a person familiar with Mr. Powell’s plans.

The administration ‌of ​President Donald ‌Trump would enact new tariffs ​almost immediately if the Supreme Court ‍struck down sweeping global ​tariffs the president launched ​under ⁠an emergency law,