An employment verification letter for immigration (EVL) is one way to satisfy proof of employment requirements that are needed for various US visas. Edu to request to be registered in the Fragomen Connect Portal.This can include tax returns, employment letters, bank statements, and other relevant financial documents. Under certain conditions, U.S. immigration law may allow a U.S. employer to file a Form I-129, Petition for a Nonimmigrant Worker, with. Getting an employer sponsored green card is a 3-step process. When asking for visa sponsorship in a cover letter, be direct and professional. First, employers must seek certification through the US Department of Labor. Below you will find a link to documents and forms. To do this, the I130 petitioner must fill out Form I864, Affidavit of Support. The person who signs the Affidavit of Support is also called the "sponsor.