<p>LOS ANGELES (AP) - The American Civil Liberties Union is demanding the removal of a tiny cross that is among historic symbols on Los Angeles County's official seal. The seal "prominently depicts a Latin cross, a sectarian religious symbol that represents the beliefs of one segment of the county's diverse population" and is an "impermissible endorsement of Christianity" by the county government, the ACLU Foundation of Southern California said in a letter to county officials this week. "Under clearly established law, the seal is unconstitutional," the letter said, warning that refusal to remove the cross in a "reasonable time-frame" would cause the ACLU to seek a court order.</p>