Republican presidential candidate Mitt Romney with former President George H.W....

Republican presidential candidate Mitt Romney with former President George H.W. Bush in Houston. (Dec. 1, 2011) Credit: AP

Former President George H.W. Bush plans to endorse Mitt Romney at an event Thursday in Houston.

Romney spokeswoman Gail Gitcho says the two will appear together and speak to reporters.

Formal backing from the 41st president is another sign that the Republican Party is uniting behind Romney as pressure builds on challengers Rick Santorum and Newt Gingrich to leave the race.

The elder Bush has offered encouraging words to Romney throughout the primary season but had withheld a formal endorsement. Former first lady Barbara Bush has formally backed Romney. She recorded automated telephone calls for him during the primary in Ohio.

Their son, former Florida Gov. Jeb Bush, endorsed Romney last week.

NewsdayTV's Doug Geed visits two wineries and a fish market, and then it's time for holiday cheer, with a visit to a bakery and poinsettia greenhouses. Credit: Randee Dadonna

Out East with Doug Geed: Wine harvests, a fish market, baked treats and poinsettias NewsdayTV's Doug Geed visits two wineries and a fish market, and then it's time for holiday cheer, with a visit to a bakery and poinsettia greenhouses.

NewsdayTV's Doug Geed visits two wineries and a fish market, and then it's time for holiday cheer, with a visit to a bakery and poinsettia greenhouses. Credit: Randee Dadonna

Out East with Doug Geed: Wine harvests, a fish market, baked treats and poinsettias NewsdayTV's Doug Geed visits two wineries and a fish market, and then it's time for holiday cheer, with a visit to a bakery and poinsettia greenhouses.

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