WASHINGTON— Sikhs in the United States expressed their frustration Thursday that President Obama would skip a tentatively planned visit to their holiest site in India, while advocacy groups called on the White House to reconsider.

Mr. Obama was expected to visit the Golden Temple in Amritsar, India, next month, but there were questions about how he would cover his head. Sikh tradition requires that men tie a piece of cloth on their heads before entering the spiritual center. The president, who is Christian, has fought the perception that he is Muslim. Sikhs are regularly mistaken for Muslims.

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