What should the letter say? Complete the Invitation Letter form.Fill out the form with correct and sincere information about you, your guest, and the entry and departure date. A letter of invitation or Affidavit of Support is not needed to apply for a visitor visa. An invitation letter for the sake of a B2 visa is not required. No invitations, no sponsorships - in fact no documentation is required. Go to "Other Services" and complete the e-form "Invitation Letter Request. Host's Information: Full name, address, contact number, and legal status in the country being visited (e.g. Citizen, permanent resident). I would like to invite you to come visit me in the United States this summer.