A one-page memo produced this week by the limited immigration group NumbersUSA argues that the House’s border security bill actually weakens current law and could act as a shield to allow Republicans to vote for “amnesty.”

In the document NumbersUSA compares provisions in the House’s border bill with provisions in the Secure Fence Act of 2006 and the 2004 Intelligence Reform and Terrorism.

“ALIPAC’s support was based on these candidates signing pledges to oppose amnesty and their strong grades with the organization NumbersUSA.”

Carter and Johnson have an A+ with NumbersUSA. Carter’s 98 percent grade is the highest of any federal lawmaker from Texas.

Numbers USA, a group that wants to lower immigration levels, awarded Gowdy an A- grade, in part for working to reduce the diversity visa lottery and what they call "amnesty entitlements."

According to the group, "Amnesties go farther than most incentives for illegal immigration because they make it impossible for illegal aliens to be forced to go back home. Amnesties reward the illegal alien with the pathway to U.S. citizenship. Millions of illegal aliens have been made part of the permanent, legal population of America since 1986."

The organization NumbersUSA, with it's self-proclaimed stance of "for lower immigration," quickly claimed a stake in the suit, saying on its website that it was "financing the effort" of the agents' suit.

NumbersUSA also emphasized on its site that Kris Kobach, the Republican Kansas secretary of state who worked on Arizona's controversial immigration law and is an informal adviser to presumed Republican presidential nominee Mitt Romney, is representing the suing agents.

NumbersUSA, an organization that says it is "for lower immigration," said on its Web site it was "financing the effort" of the agents' suit.

NumbersUSA's Web post also said Kris Kobach, an informal adviser to presumed Republican presidential nominee Mitt Romney, represents the suing agents, CNN said.