US officials have criticized Bahrain over the speed of a trial in which pro-democracy protesters were sentenced to death and life in prison for killing two policemen.
In his telephone conversation with King Hamad, Obama said the United States "believes that Bahrain's stability depends upon respect for the universal rights of the people of Bahrain, and a process of meaningful reform that is responsive to the aspirations of all Bahrainis," the White House said in a statement.
Bahrain, headquarters for the US Fifth Fleet responsible for US naval forces in the region, was hit by protests from mid-February to mid-March amid a broader revolt roiling across the Arab world.
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