U.S. prosecutors urged a federal judge to allow a review of evidence seized from Rudolph Giuliani's phones, saying the former New York City mayor was not above the law and could not block the review because he had been Donald Trump's lawyer.

The recommendation came in a Thursday night court filing, three days after Giuliani opposed the government's request for a "special master" to review records seized from 18 electronic devices, including cellphones and computers, taken during April 28 raids on his home and office.

Prosecutors have been examining Giuliani's dealings in Ukraine, including whether he violated lobbying laws by acting as an unregistered foreign agent while working for then-U.S. President Trump.

Giuliani's lawyers have demanded that prosecutors turn over documents showing what basis they had to obtain warrants to conduct the raids.