That new approach, suggested by the U.S., may run into opposition in Congress, where some lawmakers are wary of moving before other countries. Some of the changes could require the U.S. Senate to ratify changes to tax treaties, which would take a two-thirds vote and thus at least some Republican support.

I guess they do get the opportunity to vote on it, or at least make changes.

Nope the have not. G7 initiative is more panic and fear porn.