New Delhi, July 18 -- President Donald Trump's administration on Thursday finalized rules that impose strict limits on how long foreign students and journalists can stay in the United States, the latest bid to tighten legal immigration in the country.

Under a change that could be implemented as soon as September, foreigners on student visas would be admitted for the length of their academic program up to a maximum of four years.

Foreign journalists would be limited to stays of just 240 days, or around eight months, but could apply for extensions of similar duration. Chinese nationals would get just 90 days, with extensions of 90 days.

The move forms part of a broader immigration crackdown that Trump has made a centerpiece of his presid...