Musk described the legislation as a 'massive spending bill' that will ultimately increase the federal deficit.

The provision, which has provoked outcry from Democrats, would restrict federal courts' ability to enforce some injunctions.

Senate Majority Leader John Thune can afford to lose three Republican senators and still pass the bill, and there are more than that, right now, who have problems with it. Like the House, he will have to balance the concerns from moderate and conservative members of his conference.