From Global News:

The United States welcomes more visitors from Canada than any other country. Restricting access to mixed vaccines would also keep visitors out from France and Germany.

“In the weeks and months ahead we should expect more pragmatism to reign,” director for Competition Policy at the R Street Institute Ashley Nunes said.

“Cash is king. Even during a pandemic. There is considerable pressure on the administration, especially from border states, to let people in. We are not just talking about millions of dollars, we are talking about billions and billions of dollars.”