POLITICO reports on a proposed amendment to the bi-partisan immigration reform bill so long in the making which could end up killing the bill altogether:

The most serious threat to bipartisan immigration reform doesn't involve border security or guest workers or even the path to citizenship.

It’s about gay rights.

Sen. Marco Rubio (R-Fla.), an outspoken defender of traditional marriage, warned that " if that issue is injected into this bill, the bill will fail and the coalition that helped put it together will fall apart."

Faith groups that have been involved in crafting the legislation are also worried about the negative impacts of this cavalier move which, if viewed unvarnished, is nothing but another attempt to surreptitiously undermine the Defense of Marriage Act:

"We strongly would oppose the provision and it could could force us to reconsider our support for the bill," said Kevin Appleby, director of the Catholic Bishops’ Office of Migration Policy and Public Affairs. "It immediately makes the bill a partisan bill and the bipartisan effort could begin to unravel."

And Alfonso Aguilar, executive director of the Latino Partnership for Conservative Principles, issued a statement against the proposed amendment saying, in part: "We hope that President Obama and Democrats in Congress are not willing to sacrifice the legalization of millions of undocumented immigrants for the sake of appeasing the gay lobby."