A governor of s state =/= the federal government. the US Constitution vests the management of foreign affairs in the President. The Governor of Montana is just a public official expressing a private opinion, and has no official standing.
Consider the possibility that Greg Gianforte is angling for a cabinet job in a hoped-for future GOP administration, since his brash style is popular with many voters in that party, notwithstanding its sometimes criminal manifestation: https://www.npr.org/sections/thetwo-way/2017/06/12/532613316...
Consider the possibility that Greg Gianforte is angling for a cabinet job in a hoped-for future GOP administration, since his brash style is popular with many voters in that party, notwithstanding its sometimes criminal manifestation: https://www.npr.org/sections/thetwo-way/2017/06/12/532613316...