In an open letter, lawmakers told Secretary of State Marco Rubio that delays in visa-processing times risk national security and billions of dollars for the economy.

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Thirty senators wrote to Secretary of State Marco Rubio urging his agency to process international student and scholar visas in time for the start of the academic year.

Led by Alex Padilla, ranking member of the Senate Judiciary Immigration Subcommittee, the letter cited “the ongoing unavailability of visa appointments during the peak visa application season for students and scholars.” No timely visa appointments are available for students at some embassies and consulates, the senators said.

“These challenges come at a time when major academic institutions need skilled, international talent to begin their semesters. Without a fix, the repercussions will be felt across the academic and skilled-technical talent pipeline,” the letter argued.