The federal judge in Hawaii who blocked President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's revised travel ban last week has been receiving threats since issuing his ruling.

An FBI spokesman told BuzzFeed that the agency is prepared to step in and assist with the investigation into threats made against U.S. District Judge Derrick Watson, who is receiving 24-hour protection from the U.S. Marshals Service.

“The U.S. Marshals Service is responsible for the protection of federal judicial officials, including judges and prosecutors, and we take that responsibility very seriously,” the agency said.

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“While we do not discuss our specific security measures, we continuously review the security measures in place for all federal judges and take appropriate steps to provide additional protection when it is warranted.”

Watson issued a sweeping block of Trump's revised travel ban on March 15, halting enforcement of the president's second attempt at the measure, which would have barred citizens of six predominantly Muslim countries from entering the U.S.

The ruling sets the case up for another hearing in the San Francisco-based 9th Circuit Court of Appeals, which upheld a block on Trump's original Jan. 27 travel ban. The president has vowed to appeal Watson's ruling up to the Supreme Court.