Fred Thompson has been endorsed for president by the National Right to Life Committee.
The endorsement by the prominent anti-abortion group could give a boost to the campaign of the Republican former Tennessee senator, who has seen his poll numbers drop in recent weeks and has failed to become the consensus candidate for conservatives.
The decision was disclosed Monday by two Republicans who spoke on condition of anonymity in advance of the announcement that was expected Tuesday.
Thompson boasts a 100 percent voting record in opposing abortion but has faced criticism from some conservatives for what they consider conflicting statements in the past.
The endorsement comes after a week in which Thompson watched GOP competitors wrap up endorsements from prominent conservatives: Rudy Giuliani from televangelist Pat Robertson, Mitt Romney from Paul Weyrich, John McCain from Sen. Sam Brownback, and Mike Huckabee from Donald Wildmon.