The competent authorities of Switzerland and the USA signed a Memorandum of Understanding on 19 June in Bern and on 25 June in Washington.
This clarifies that the references to the North American Free Trade Agreement (NAFTA) in Article 22(3)(a) and (b) of the Swiss-US Double Taxation Agreement and in paragraph 7 of the Memorandum of Understanding are to be understood as references to the US-Mexico-Canada (USMCA) agreement once it enters into force.
The agreement is available here.