Canadian and Mexican Citizens may apply for the TN Status.

Canadian citizens may obtain a TN immigration status and enter the U.S. by applying at a U.S. port of entry or pre flight inspection center.

Mexican citizens may obtain a TN immigration status and enter the U.S. by applying at a U.S. consulate or embassy.

TN status is granted for 1 year increments with unlimited renewals.

For more information and what documents are needed, please visit the USCIS website.

The department should also write a letter of support for the prospective TN visa holder.  You can download a sample letter here.