LONDON — The UK will review the way it calculates the number of immigrants in the country after finding that more international students leave after finishing their courses than was previously thought.

The question of whether students should be included in migration numbers has been a long-running row for the Conservative government, with some prioritizing a pledge to cut net migration to 100,000 a year and others valuing the economic and academic contribution that foreigners make to British universities. Immigration is a key issue in the Brexit debate.

“The Home Secretary is announcing today a review into the impact of international students on our system,” Schools Minister Nick Gibb told the BBC on Thursday. — Bloomberg