Department of Homeland Security Border Agents at some U.S. Ports of Entry along the Canadian border have begun directing Canadians seeking L-1 Visa renewals to instead submit to the lengthy process of filing an extension petition with USCIS. Under previous practice, highly skilled Canadian Citizens applying for extensions of their L-1A and L-1B classifications were able to expedite the process by applying at airports and border stations. The practice has put a strain on employees that work and travel between U.S. and Canada as well as their U.S.-based employers.