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Polls show 70 percent of the American public opposed to the administration’s Iraq policy, with majorities also favoring an immediate withdrawal of U.S. forces.

Mr. Bush, for the second consecutive day, sent National Security Adviser Stephen J. Hadley to Capitol Hill to meet with Republican lawmakers. He met with seven Republican senators who have voiced concern about the president’s policy, including Sen. Olympia J. Snowe of Maine, who yesterday became the first Republican since the last round of Senate votes to switch positions to favor a troop withdrawal to be concluded by April 30.

Republican Sens. Gordon H. Smith of Oregon and Chuck Hagel of Nebraska already have supported similar measures.

Most Democrats are expected to support the legislation, but Republican opponents have vowed to block a final vote, and they appear to have enough strength to do so.

c This article was based in part on wire service reports.