The Republican presidential candidate and former New York mayor planned to announce Wilson's support at a news conference Thursday in Santa Monica, according to several people with knowledge of the endorsement. They spoke on the condition of anonymity because they were not authorized to discuss the matter publicly.
Wilson's stamp of approval will bring together two Republicans who served as big-city mayors and occupy similar political terrain.
Both are known for being able to draw votes from across party lines, and blend moderate social views on issues like abortion with conservative thinking on the economy and national defense.
Giuliani's campaign declined comment.
Wilson did not return telephone calls placed to his office.
The former governor will become Giuliani's most recognized supporter in the state. He has deep connections in California politics, having served as San Diego mayor, a member of the Legislature, a U.S. senator and two-term governor. Wilson also is close to Republican Gov. Arnold Schwarzenegger.
[Associated Press; by Michael R.
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