The Trump administration will cap international students’ stay in the U.S. at four years, regardless of the length of their academic program, under a rule finalized Thursday. Two types of visas popular among foreign students and academics — F and J visas — will require holders to apply to the U.S. Department of Homeland Security for an extension if they need more time to complete their studies. The change is set to take effect mid-September. Under the rule, eligible international students already studying in the U.S. can stay for the remainder of their program or for up to four more years. However, they could lose that option if they leave the U.S. during that period.