A package addressed to Harris found Friday at a Sacramento mail facility was the 13th device officials said they had linked to Sayoc.
Former President Barack Obama questioned President Donald Trump's calls for civility on Friday, pointing out that Trump has repeatedly unleashed rhetorical attacks on the media and his political opponents, most of whom are Democrats.
The adjudication of some of the other arrests could not immediately be determined from the summary of offenses provided by the Department of Law Enforcement.
She said Sayoc used her address once years ago to collect his mail.
"They have a major role to play as far as tone, as far as everything", Trump said. But Enders did say that the promotion of paranoid thinking by Trump and others at the highest levels of the Republican establishment might have a hardening effect on those already ensconced in conspiracy theories.
On a now-removed Facebook page, Sayoc was seen in photos and videos attending Trump rallies.
"We will not tolerate such lawlessness, especially not political violence, " Attorney-General Jeff Sessions said. The van was so conspicuous that some passersby had noticed the van even before Sayoc was announced as a suspect in connection to this week's pipe bombs.
"We do believe that we've caught the right guy but... there's a lot of work still to be done, which means there are still plenty of unanswered questions", Federal Bureau of Investigation director Christopher Wray told a news conference. Authorities told AP that the devices were not rigged to explode when the packages were opened, but they said they were not sure whether that was because the devices were poorly made or were not meant to harm. The accounts remained online much of Friday before Twitter suspended them. But he said they did contain potentially explosive material, adding: "These are not hoax devices".
Sayoc was charged with transporting explosives across the state, illegally mailing explosives, threatening former presidents and other and assaulting federal official, according to charging documents. Using the same account, Sayoc identified himself as a member of the Seminole Tribe of Florida and as an employee of Hard Rock Live, which is owned by the tribe.
This comes after Ritchie tweeted a screenshot on Friday of a tweet she received from the Altieri Twitter account. On both the packages and the social media posts, her name was spelt "Shultz", according to the complaint.
Sayoc, who is a registered Republican, has a criminal record that dates back to 1992. He also had several arrests going back to the 1990s for theft, obtaining fraudulent refunds and tampering with evidence.
Ronald Lowy, a Miami attorney, told the Associated Press Sayoc became frustrated about a lack of service and told a Florida Power and Light employee "something to the effect that you're not taking care of my problem and I bet you would if I threw a bomb at you". They show that Sayoc pleaded guilty and was sentenced to one year of probation.
Asked on "Fox News Sunday" whether Trump bears any responsibility for the recent incidents, Kirstjen Nielsen, the current secretary of Homeland Security, said the president "has made it extraordinarily clear that we will never allow political violence to take root in this country".
Cesar Sayoc is an amateur body builder and former stripper, a loner with a long arrest record who showed little interest in politics until Donald Trump came along. Debbie Stabenow and Democratic gubernatorial candidate Gretchen Whitmer. He said possible DNA evidence was found on another package.
"We are investigating what happened and will continue to work to improve how we handle concerns raised by anyone on Twitter", it said in a statement.