Sen. Lindsey Graham of South Carolina seems to be the only GOP senator on board, but he has told Democrats they will lose his support unless they find another Republican.
Obama called Sen. Scott Brown, R-Massachusetts, to try to get him to sign on, as well as four other GOP senators: Lisa Murkowksi of Alaska, Richard Lugar of Indiana, George Lemieux of Florida and Judd Gregg of New Hampshire.
CNN contacted aides to those senators, and all said none gave the president a commitment to work with Democrats on immigration reform.
Democratic sources say they will probably work to get GOP support for another few weeks and then weigh how to proceed.
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