David Frum writes, "It's Divorce":

That's what has happened between President Bush and his party over this immigration bill. And if they insist on pursuing it, I fear it is what will happen between the Senate GOP leadership and the party base as well. The issue has already all but killed the McCain candidacy. A letter from a reader expresses the sadness and anger I see in so much of my mail:

I voted twice for this man and his abdication of the most fundamental executive responsibility, to protect our country from foreign invasion, is cause for regret.

Talk is cheap. The most responsible course of action that this president can take on immigration is to do nothing. Leave it for the next president. Focus on Iraq and then go home.

Signing this bill would render what little good he has done meaningless by comparison.

I wish he were already gone.

Further thoughts from The Washington Examiner and Jim Geraghty.

Update: Allahpundit notes that the divorce may be mutual:

First it was Chertoff, then Bush, now Chavez: three Republicans, one of them president, another a cabinet member, the third a would-be cabinet member, all not merely criticizing the base’s position on amnesty but impugning their character for taking that position.