Former President Bill Clinton is expected to cross a picket line set up by gay rights activists and labor leaders to deliver a speech in San Diego on Sunday.

Clinton is scheduled to speak at the annual convention of the International Franchise Association at the Manchester Grand Hyatt hotel.

Gay rights group Californians Against Hate is boycotting owner Doug Manchester's two San Diego hotels, the Manchester Grand Hyatt and the Grand Del Mar, and his McCall, Idaho resort, the Whitetail Club, due to the hotelier's $125,000 donation in support of Proposition 8 – the ballot box initiative that yanked back the right of gays and lesbians to marry in California on November 4.

So far the boycott has cost the hotel more than $2 million in lost revenues, reports the San Diego Business Journal.

The boycott is also supported by leaders of UNITE HERE, the recently merged union that represents textile, hotel and restaurant employees, a strong supporter of gay marriage.

“It is such a slap in the face to the labor movement and the LGBT community,” Cleve Jones, a veteran gay rights activist who does organizing for UNITE HERE, told The Associated Press. “His participation is helping to further enrich a proven enemy of equality.”

A Clinton spokesman, Matt McKenna, says Clinton remains a supporter of equality for gay and lesbian Americans but will honor his commitment to speak.

“If you are a champion of equality, you should not be a guest of Doug Manchester,” Geoff Kors, president of Equality California, the group which led the fight against Proposition 8, said in a statement.

According to the International Franchise Association, as many as 3,000 people are expected to attend their four-day annual convention that began Saturday.

Backers of gay marriage have arranged to gather outside the hotel Sunday at 11AM. Clinton is scheduled to speak at 12:30PM.