CNN received one of the suspicious packages at its NY office.
Previous suspicious packages were addressed to former President Barack Obama, former Secretary of State Hillary Clinton, liberal billionaire George Soros, former Attorney General Eric Holder, former CIA Director John Brennan and California Democratic Rep. Maxine Waters. Democrats Booker and Harris are potential 2020 presidential candidates.
Trump previously called former CIA Director John Brennan, who was another target of the would-be bomber, a "loudmouth, partisan, political hack who can not be trusted with the secrets to our country!"
The US Secret Service and Department of Homeland Security have intercepted at least 14 potentially risky explosive devices that were allegedly sent by Florida resident Cesar Sayoc Jr. The packages were almost identical - six inch PVC pipes with wires, stuffed inside a bubble-wrap lined manila envelope, according to the complaint.
The 11th package was addressed to Booker, a Democratic senator from New Jersey, and was discovered at a mail sorting facility in Florida, the Federal Bureau of Investigation said.
"It's too early at this stage for us to be discussing motivation in this particular case", Wray told a news conference. If convicted, Sayoc could be sentenced to up to 48 years in prison, officials said.
They are Trump's campaign chairman, his deputy campaign manager, his national security adviser, his personal lawyer and a foreign policy aide. This also happens to mirror the verbal approach our President has taken toward the Federal Bureau of Investigation and Department of Justice. Wray said each device consisted of about six inches of PCP piping, a small clock, a battery, wiring, and "energetic material" that reacts to heat, shock or friction. The man has been dubbed the "MAGAbomber" by media, as the bombs targeted prominent US Democrats and opponents of Donald Trump.
Multiple law enforcement sources told ABC News the suspect was tracked using a cell phone.
According to a law enforcement official, Sayoc was living in the van after having been kicked out of his parents' home.
Clues appeared to confirm their suspicions.
And he was probably unaware that investigators scouring his social media accounts had found the same spelling mistakes on his online posts - "Hilary" Clinton, Debbie Wasserman "Shultz" - as on the mailings he'd soon be charged with sending.
In 2012, Sayoc filed for bankruptcy in Broward County. Authorities said Friday a fingerprint from the Waters mailing was key in identifying the subject.
Authorities were reportedly able to track down Sayoc through cell phone records.
He recently endorsed the body-slamming of a reporter, routinely denounces the press as "fake news" and has leveled toxic remarks in the past against the pipe bomb targets.
The first bomb appeared Monday.
The FBI called them "potentially destructive devices" - so either the bombmaker was good enough to ensure none would go off and never intended them to explode, or they were poorly constructed. "There may be more packages in transit now".