A team working for President Donald Trump's spy chief, Tulsi Gabbard, last spring led an investigation into Puerto Rico's voting machines, said Gabbard's office and three sources familiar with the previously unreported events, Reuters reported. 

The sources said the goal was to work with the FBI to investigate claims that Venezuela had hacked voting machines in Puerto Rico, but added the probe did not produce any clear evidence of Venezuelan interference in the U.S. territory's elections. Reuters first reported the investigation.

the May investigation but denied a link to Venezuela, saying its focus was on vulnerabilities in the island's electronic voting systems, according to Reuters.