FBI Director Christopher A. Wray said that the bureau was still trying to determine if Sayoc's bombs were "functional" but noted that they contained "energetic material" that could be unsafe.
Interstate transportation of an explosive.
Sayoc's past is marked by encounters with law enforcement.
He pleaded guilty to the offense, records show, and was sentenced to one year of probation.
Lowy told The Associated Press that Sayoc "made a verbal threat when he was frustrated at a lack of service". He was arrested outside a Florida mall. The suspect's van was covered with decals and messages praising Trump and attacking the president's critics ― including a sticker saying "Dishonest Media" and "CNN Sucks", echoing Trump's own frequent vilification of news media. Soros was the first recipient of the risky packages identified. Sayoc was arrested Friday in Florida after investigators said they identified him through fingerprint and DNA evidence.
Authorities have not said whether the van seized in Florida was linked to Sayoc. According to Moore, Sayoc belongs to a group of men "led to believe, [they] were and are under attack by the likes of Hillary and Michelle and all those "feminazis" who've had but one mission: political castration".
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Two weeks ago, Sayoc threatened a former Democratic congressional spokeswoman on Twitter after her appearance on Fox News.
Sayoc was sentenced to probation in August 2002 for threatening to throw a bomb during a conversation with a Florida utility representative, the AP reported. They declined to comment until after the hearing.
"We have seen an effort by the media in recent hours to use the sinister actions of one individual to score political points against me and the Republican Party". Several posts contained anti-Muslim statements.
A Linkedin file containing a picture that matches the suspect's boasts over 500 connections but is extremely vague on professional experience both in terms of employment history and time frame.
On his LinkedIn account, Sayoc described himself as a choreographer and booking agent for male strippers and burlesque shows. It is not immediately clear if those claims are accurate. Sayoc 56, of Aventura, Florida was arrested at an auto parts store in the nearby city of Plantation.
President Donald Trump is calling billionaire businessman Tom Steyer a "crazed & stumbling lunatic" just days after Steyer was targeted in a mail bomb plot on prominent Democratic officials.
"Criminals make mistakes so the more opportunities that law enforcement has to detect them, the greater chance they're going to be able to act on that, and that appears to be what happened here", said former Justice Department prosecutor Aloke Chakravarty, who prosecuted the Boston Marathon bombing case. He said 50 officers swarmed the suspect's van with their firearms drawn.