If you apply online, fill out the application for a permanent resident travel document (IMM 5444) form in the permanent residence portal. A Reentry Permit allows a lawful permanent resident or conditional permanent resident to apply for admission to the.U.S. permanent residents​​ Canadians who are permanent residents of the United States must present a valid U.S. permanent resident card upon entry. Steps to become a Canadian citizen. Get proof of citizenship. (If you need more space, continue on a separate sheet of paper.) Part 5. Complete Only If Applying for a Re-entry Permit. Acceptable documents that confirm citizenship and identity when travelling alone or with children or minors. Photocopies are not acceptable. Electronic System for Travel Authorization (ESTA).