All US bills need 2/3 Senate majority approval to pass, assuming the lawmakers even make their bill progress to that stage. I don't think it stands a chance at getting to the voting part though - stablecoin companies will lobby against this bill since it would give USD PAX/USDC and even Tether (at least for some time) headaches.
Actually, to a completely bill is approved and release offically, it must a lot of time and it's also not easy, because USDT will not sit tight and the influence of USDT to the cryptocurrency market now is too much. I mean news like this maybe cause confusions for investors about stable coins and they will continue to hold Bitcoin instead of transfering to stable coins when they want to take profit.