Former New York City Mayor Rudy Giuliani (R) blasted longtime Orange County Rep. Loretta Sanchez (D-Calif.) on Monday for remarking in late September that "the Vietnamese" were trying to take her seat.

"The Vietnamese and the Republicans are, with an intensity, trying to take this seat from which we have done so much for our community — to take this seat and give it to this Van Tran, who is very anti-immigrant and very anti-Hispanic," Sanchez had commented in an interview with Univision.

Giuliani on Monday called the statement "highly offensive." 

"It was an attempt to divide, to make it an ethnic conflict," he said.

The one-time presidential candidate appeared on behalf of Sanchez's challenger, state assemblyman Van Tran, at an event in the Little Saigon district of Westminster, in Orange County.

Republican senatorial candidate Carly Fiorina also attended the event, prompting Giuliani to criticize her opponent, Sen. Barbara Boxer (D-Calif.).

"I mean, it is time for a change. Gosh almighty, hasn't it been long enough that she [Boxer] has been doing ruinous things for the state of California and the United States of America?"

Giuliani also campaigned for Republican gubernatorial candidate Meg Whitman in Los Angeles on Sunday.