After Monday's hearing, the case is expected to move to a federal court in NY.
The US documentarian captured former bouncer, strip club DJ and pizza delivery driver Sayoc, who is accused of sending 13 explosive devices to targets including Barack Obama and Bill Clinton, at the rally in Florida, while making his recent movie Fahrenheit 11/9.
Sayoc will eventually be prosecuted in Manhattan and could be sentenced to a maximum of almost 50 years in prison if convicted.
Even as Sayoc was taken into custody, investigators continued to chase potential bombs.
Law enforcement officials told The Associated Press that the devices, containing timers and batteries, were not rigged like booby-trapped package bombs that would explode upon opening.
Lowy said he is concerned that Sayoc's mental health has deteriorated further since then and said his former client cut off all ties with his family three-and-a-half years ago.
Fingerprint and DNA evidence helped identify the suspect, officials said. 27, published a news article headlined "How the package-bomb suspect found inspiration in Trump".
Investigators believe that Sayoc made the pipe bombs in the van, two law enforcement sources said.
The suspect, who has a long criminal history dating back to the 90s which included domestic violence and drug charges, also lived in Charlotte, North Carolina in and was arrested in 1999 for possessing a stolen vehicle in Mecklenburg County.
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Sayoc targeted individuals who'd been bashed by the president, the packages and his van plastered with pro-Trump, anti-left and anti-media messages all indicating he was politically motivated.
In the interview on CNN, Steyer renewed his call for the president to be impeached and slammed Trump's rhetoric.
United States justice department officials said the bombs were "not hoax devices" and warned there could be more still undiscovered.
Cesar Altieri Sayoc (in dark shirt), who was arrested during an investigation into a series of parcel bombs, is escorted from an FBI facility in Miramar, Fla., Oct. 26, 2018, in this still image from video.
Moore spoke on Friday after it emerged that, along with pictures of Trump and Mike Pence, Sayoc's van featured pictures of him, Hillary Clinton and Green Party leader Jill Stein with targets over their heads.
Trump vowed that anyone responsible for mailing the suspicious packages will be prosecuted to the "fullest extent of the law".
"Political violence must never ever be allowed in America and I will do everything in my power to stop it".
"There's no blame, there's no anything", Trump said. "The media's constant unfair coverage, deep hostility and negative attacks only serve to drive people apart and undermine healthy debate".