By Andrew Chung

The U.S. Supreme Court on Thursday dismissed a case in which Republicans sought to keep in place a policy introduced under former President Donald Trump that had let American officials quickly expel hundreds of thousands of migrants at the U.S.-Mexico border.

The now-expired policy, known as Title 42, was implemented by Trump's administration in March 2020 - early in the COVID-19 pandemic - as a measure tied to a public health emergency. The court had canceled arguments in the case in February.

(Reporting by Andrew Chung in New York; Editing by Will Dunham)