US news accounts said authorities believe that Sayoc was making his way through the list, which NBC said included journalists and entertainers, when he was apprehended last week.
CBS News confirmed that Cesar Sayoc had a list of more than 100 people to whom he meant to send packages.
The clues, authorities say, led them to a 56-year-old man with a long criminal history who'd previously filed for bankruptcy and appeared to be living in his van, showering on the beach or at a local fitness center.
He is accused of mailing suspected explosives to, among others, former President Barack Obama; former Vice President Joe Biden, a potential 2020 opponent of Trump; Trump's 2016 Democratic challenger Hillary Clinton; and two national security officials who served in Obama's administration.
His arrest Friday came just hours after the Federal Bureau of Investigation intercepted two more suspicious packages, one addressed to Democratic Senator Cory Booker, the other to former National Intelligence Director James Clapper. A law enforcement official tells CBS News that Sayoc had a list of more than 100 others in his van when he was captured.
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Sayoc made an initial appearance Monday in Miami federal court, where prosecutors said they will seek to keep Sayoc jailed until trial, calling him a flight risk and a danger to the community.
News of that latest package surfaced with just over a week to go in highly charged political campaigns across the nation leading up to November 6 elections, in which Democrats are battling to seize control of a Congress now held by Trump's Republican Party. A judge will hold a hearing Friday on whether Sayoc can be released on bail.
Sayoc was arrested Friday outside an auto parts store in Plantation, Florida, near Miami, and authorities also seized a white van that Sayoc appeared to live in.
On Thursday from noon to 9 p.m.as law enforcement grew ever closer, descending on a postal sorting facility in Opa-locka, Florida, Sayoc was working as a disc jockey at a West Palm Beach nightclub where he'd found work in the last two months.
Court records show he had been arrested at least nine times, mostly in Florida, for accusations of grand theft, battery, fraud, drug possession, and probation violations.
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The caller "threatened to blow up the building if FP&L turned off his light", the report said.
Records show he threatened to make it "bigger than 9/11".
Sayoc posted his political views on social media and was prolific on his two Facebook accounts and three Twitter feeds, often posting provocative photos and memes attacking liberals.
He took on Tallahassee Mayor Andrew Gillum, the Democratic nominee in the Florida governor's race, more than 80 times in October alone. Moore and other like-minded people commenting on the footage are concerned there could be more Trump supporters who have been radicalized to the point of attempting more acts of terrorism in the name of the MAGA movement.
Among the others Sayoc is alleged to have sent explosives devices were businessman and philanthropist George Soros, Joe Biden, Maxine Waters and former Central Intelligence Agency director John Brennan. And Eric Himpton Holder Sr.
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As recently as Wednesday, Sayoc posted a tweet that was critical of Soros, Obama and others.