Sayoc faces almost 50 years in prison if convicted.
In support of that argument, assistant prosecutors to Manhattan U.S. Attorney Geoffrey Berman confirmed the November 2 discovery of a 16th explosive device, the second that Sayoc allegedly mailed to Thomas Steyer, the California-based billionaire hedge fund manager and philanthropist who has criticized Trump.
Sayoc last week waived a similar hearing in Miami near where he was captured on October 26.
He appeared in court last week in Miami, where he had not yet entered a plea to charges of five federal crimes - interstate transportation of an explosive, illegal mailing of explosives, threats against former presidents and certain other persons, threatening interstate communications, and assaulting current and former federal officers.More news: Trump points to second term as U.S. president
None of the devices exploded, and no one was injured in the pipe bomb scare.
Prosecutors say they will ask a judge to hold Sayoc without bail because he is considered unsafe.
His lawyers did not attempt to seek his release on bail after prosecutors released a letter outlining more evidence against him, including DNA linking him to 10 of the explosive devices and fingerprints on two of them.More news: Breaking Bad Is Getting a Feature Film
The suspect was living in a van plastered with pro-Trump and anti-Democrat stickers when he was arrested at an auto store in Plantation, Florida. Kamala Harris, D-Calif., former CIA Director John Brennan and former Director of National Intelligence James Clapper.
Just days after CNN was sent a mail bomb, Trump tweeted that the "fake news media" are the "true enemy of the people".
Assistant prosecutors to Manhattan U.S. Attorney Geoffrey Berman confirmed another explosive device Sayoc allegedly mailed to California-based billionaire hedge fund manager Thomas Steyer was discovered Friday, USA Today reported.
While Sayoc's attorneys have not commented on his mental health, his mother wrote a letter to ABC News saying he has suffered from mental illness for years.More news: New Wave of Faux Elon Musk Accounts Run Bitcoin Scams on Twitter
"Although the Government's investigation is ongoing, the evidence gathered to date demonstrates the dangerousness of the defendant and creates significant incentives for him to flee", prosecutors wrote.
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