According the Peter Prengaman of Associated Press:

"I did not do this. I did not approve of any letter," Tan D. Nguyen, the GOP challenger to Democratic U.S. Rep. Loretta Sanchez, told The Associated Press.

The investigation is focused on Nguyen's campaign, according to two law enforcement officials who spoke on condition of anonymity because they are not authorized to publicly discuss it.

Nguyen, a Vietnamese immigrant who has made halting illegal immigration a main plank of his platform, said he believed an employee in his office might have used his campaign's voter data base to send the letter without his knowledge. He said that employee has been "discharged."

The letter, written in Spanish and mailed last week to an estimated 14,000 Democratic voters in central Orange County, tells recipients: "You are advised that if your residence in this country is illegal or you are an immigrant, voting in a federal election is a crime that could result in jail time."....Read full article

Gov. Arnold Schwarzenegger, Scott Baugh, chairman of the Orange County Republican Party, and a group of Vietnamese-American candidates running for office in Orange County, have condemned, denounced the letter and called for the investigations.