Thompson dropped out of the GOP race after a poor showing in the Iowa straw poll.
(CNN) – Former Wisconsin Gov. Tommy Thompson will announce Friday he is endorsing Rudy Giuliani for president, an official in the former New York City mayor’s campaign tells CNN.
The announcement will take place in Charleston, South Carolina.
Thompson, who also served in President Bush’s Cabinet as the Health and Human Services Secretary, gave up his own White House bid in August after failing to crack the top tier in the Iowa Straw Poll.
– CNN Political Desk Managing Editor Steve Brusk