Bruno Rodriguez insisted there is no evidence tying Cuba to mysterious attacks on diplomats in Havana.
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The US will also issue an updated travel warning for Cuba.
Tillerson met with Cuban officials on Tuesday to discuss unexplained incidents harming US diplomats in Havana.
Cuba denied involvement in alleged attacks that left Americans with symptoms such as hearing loss and concussions.
The Secretary of State signaled a hardline stance on Cuba a day after the senators sent him a letter.