The U.S. government is moving to speed up asylum claim processing at its northern border in an attempt to deter migrants from illegally crossing over from Canada.

Washington is making two changes that fall under the Safe Third Country Agreement (STCA), which calls for asylum seekers to apply for refugee status in the first of two countries they enter.

First, migrants looking to prove that they're exempt from the STCA will have to provide their documents to U.S. border officials at the time of their screening. Migrants previously were allowed to postpone screenings to gather necessary documentation.

Second, migrants will only have four hours — down from 24 hours — to consult a lawyer prior to their screening.

CBS News first reported on the changes. The U.S. Department of Homeland Security (DHS) confirmed the changes to CBC News.

"DHS carefully reviewed its implementation of the Safe Third Country Agreement with Canada and concluded that it could streamline that process at the border without impacting noncitizens' ability to have access to a full and fair procedure for determining a claim to asylum or equivalent temporary protection," the department said in a media statement.

The U.S. has seen a sharp increase in illegal crossings into the country from Canada in the past few years.

Border agents have taken 12,612 migrants who crossed the U.S.-Canada border illegally into custody in the first six months of 2024, according to U.S. Customs and Border Protection. That's up from 12,218 in all of 2023 and is more than the number that were taken into custody in 2021 and 2022 combined.

Earlier this year, Ottawa reimposed some visa requirements on Mexican nationals visiting Canada, in part to answer a request from Washington to help stem illegal border crossings into the U.S. The number of Mexican migrants attempting to cross into the U.S. from Canada has since dropped.

In 2023, Prime Minister Justin Trudeau and U.S. President Joe Biden announced that they were making changes to the STCA by expanding its application to the entire Canada-United States border, rather than just official points of entry.