Ask for the profession named as on the USMCA list, a duty description that reads as professional nursing, the salary, the expected duration and a statement of who employs and supervises her. Vague phrases about a pending licence or a future role should be removed.
A letter that answers the officer's questions in order
The officer works through a short sequence: citizenship, listed profession, qualification, prearranged professional employment and temporary intent. The employer's letter carries most of that sequence, so it should be organized the same way. It should state that the position is a Registered Nurse role, describe clinical duties rather than administrative ones, give the unit and the shift pattern if known, state the salary and the intended length of stay, and identify the legal employer if a staffing intermediary is involved. Attach the state licence or a board letter confirming issuance, the health-care worker certification, the Quebec licence, the diploma and any translations required for French-language records. Letters that describe the role as a future opportunity, condition employment on a licence not yet issued or leave the employer's identity unclear invite a refusal that a stronger draft would have prevented.
Hypothetical example: A Canadian citizen urban planner is offered a role preparing zoning analyses for a U.S. municipality. Her first review produces a cross-reference between the letter's duties, the profession named in the rules and the degree record that qualifies her. A portfolio of attractive drawings does not settle the credential or employer question. She should obtain a signed duty description and the municipal appointment record before travel, then ensure that every translated exhibit uses the same name and dates as the letter. That sequence exposes a generic consulting agreement before it is presented as a professional appointment.