"We have invited more than 100 foreign delegations, more than 1,000 representatives here", Pompeo said.
The top US diplomat assured the audience of Washington's unwavering commitment to religious freedom.
"All people from every place in the globe must be permitted practice faith openly in their homes, in their places of worship, in the public squares, and believe what they want to believe", he said.
Last year, Pompeo called on the UN to establish a new day of global remembrance for victims of religious persecution.
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