GOP officials are urging Nguyen to drop out of the race in California's 47th District. Orange County Republican Party Chairman Scott Baugh rejected Tan Nguyen's assertion that Nguyen was not involved in mailing a controversial letter that falsely advised immigrants they could be prosecuted if they voted in the upcoming election.
The letter was sent to as many as 14,000 Democrats in Orange County.
Nguyen said in a statement Thursday the letter was sent by an employee of his campaign without his knowledge, and that the employee has been discharged. Baugh said he had determined that Nguyen was personally involved in sending the mailer.
Gov. Arnold Schwarzenegger and several members of Congress have denounced the mailer, the newspaper said.
Nguyen, who immigrated to the United States from Vietnam in the 1980s, has made illegal immigration a centerpiece of his campaign.