He told ABC's This Week, "Sometimes, it takes time for some of these complex issues to evolve. And it looks like immigration, you know, has a chance to pass," Bush said.
"The reason to pass immigration reform is not to bolster a Republican Party -- it's to fix a system that's broken. Good policy yields good politics as far as I'm concerned.
"It's very important to fix a broken system, to treat people with respect and have confidence in our capacity to assimilate people," Bush said. "It's a very difficult bill to pass because there's a lotta moving parts. And the legislative process is-- can be ugly. But it looks like they're making some progress."
The bill, if passed, would allow 50,000 undocumented Irish to stay.