Rep. Sam Johnson (R-Tex.). (washingtonpost.com)

And then there were five.

Two Republican members of the bipartisan House "Group of Seven" that is working on plans to overhaul the nation's immigration laws are leaving the group, saying that they can no longer trust President Obama to enforce whatever new immigration laws Congress might eventually approve.

Reps. John Carter (R-Texas) and Sam Johnson (R-Texas) said in a joint statement Friday that despite working on the issue for four years, "we have reached a tipping point and can no longer continue working on a broad approach to immigration."

"The problem is politics," they said, citing the president's support for the Affordable Care Act and for what they said was his continued disregard of the Constitution "to advance his political agenda."