A Republican gay rights group frustrated with the Obama administration's failure to repeal the "don't ask, don't tell" law is challenging the policy's constitutionality in federal court in Southern California.
The trial in Riverside starts Tuesday and is scheduled to last two weeks.
Dan Woods, attorney for the Log Cabin Republicans, says he wants a federal judge to halt the policy immediately nationwide.
The case is a broad attack on the law that prohibits the military from asking about the sexual orientation of service members and requires discharge of those who acknowledge being gay.
The Log Cabin Republicans has 19,000 members. Its website says it's the nation's largest organization of Republicans who support "fairness, freedom and equality for gay and lesbian Americans."
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