The bill’s first fatal deficiency is that it doesn’t solve the illegal-immigration problem. The enforcement provisions are riddled with exceptions, loopholes, and waivers. Every indication is that they are for show and will be disregarded, just as prior notional requirements to build a fence or an entry/exit visa system have been – and just as President Obama has recently announced he’s ignoring aspects of Obamacare that are inconvenient to enforce on schedule. Why won’t he waive a requirement for the use of E-Verify just as he’s unilaterally delayed the employer mandate? The fact that the legalization of illegal immigrants comes first makes it all the more likely that enforcement provisions will be ignored the same way they were after passage of the 1986 amnesty.

Marco Rubio says he doesn’t want to have to come back ten years from now and deal with the same illegal-immigration problem. But that’s exactly what the CBO says will happen under his own bill. According to the CBO analysis of the bill, it will reduce illegal immigration by as little as a third or by half at most. By one estimate, this means there will be about 7.5 million illegal immigrants here in ten years. And this is under the implausible assumption that the Obama administration would administer the law as written.