NAFTA has a provision for no-visa entry as an "internal transfer". Having a Canadian office is not unheard-of to invoke this position, by stationing an employee they really want at a US office in a Canadian office and then transferring.

While politicians may be motivated, there's no indication they would be motivated more by THIS business than by ANY OTHER business, all of which have the same concerns, have had the same concerns for years, and immigration has generally been avoided.