Re: TN Visa Letter Format
TN visa is issued by the US immigration at the border as you enter the US. You can not get it when already in the US you have to leave and re enter. The letter you need is a letter from employer confirming employment
Found this on the US immigration website
A Canadian citizen without a TN visa can apply at a U.S. port of entry with all of the following:
* Request for admission under TN status to Department of Homeland Security, Customs and Border Protection, U.S. immigration officer;
* Employment Letter - Evidence of professional employment. See Employment Letter below;
* Proof of professional qualifications, such as transcripts of grades, licenses, certificates, degrees, and/or records of previous employment;
* Proof of ability to meet applicable license requirements;
* Proof of Canadian citizenship- Canadian citizens may present a passport, as visas are not required, or they may provide secondary evidence, such as a birth certificate. However, Canadian citizens traveling to the United States from outside the Western Hemisphere are required to present a valid passport at the port-of-entry;
* Fee of U.S. $50
http://travel.state.gov/visa/temp/types/types_1274.html
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