Iran's Foreign Ministry spokesperson, Esmail Baghaei, called President Donald Trump's claim "false and baseless," according to a report on Iranian state television.
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Also, Iran's paramilitary Revolutionary Guard separately issued a statement saying the Strait of Hormuz "is firmly and decisively under the control" of its forces.
"This strait will not be opened to the enemies of this nation through the ridiculous spectacle by the president of the United States," it added.