The package addressed to Brennan was sent care of CNN's NY bureau, prompting a chaotic morning of must-see TV live from the streets of Manhattan as police evacuated the Time Warner Center and cordoned off several city blocks in the downtown core.
Security personnel at Tribeca Productions summoned police at around 5am on Thursday and the bomb squad removed the package and took it away for investigation.
"President Trump has departed from the way most presidents behave when there's an act of domestic terrorism", said Michael Cornfield, associate professor at the George Washington University Graduate School of Political Management. The packages were not addressed to Harris or her office. He will be prosecuted in NY, where five of the 12 devices were found.
The first crude bomb to be discovered had been delivered Monday to the suburban NY compound of George Soros, a liberal billionaire and major contributor to Democratic causes.
UPDATE (10/26/18, 2:57 p.m.): During a press conference, Federal Bureau of Investigation director Chris Wray announced that the suspicious packages containing what is believed to be pipe bombs were "not hoax devices", and a total of 13 were sent to Democrats and vocal opponents of Donald Trump.
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The outspoken Democrat representative is frequently criticised by Mr Trump.
As the scope of the attack became clearer on Wednesday, Mr Trump decried political violence during a scripted event in the White House East Room and other members of the administration said it has no place in American society. None of the devices has detonated, and no injuries have been reported. "The president, and especially the White House press secretary, should understand that their words matter".
Trump responded to the series of bomb threats at the rally in Wisconsin on Wednesday, and said, "Any acts or threats of political violence are an attack on our democracy itself".
"The new guidance we are issuing today builds on the new flexibility we've already given states through our rule making to lower premiums and increase choices for Americans", CMS Administrator Seema Verma said on a call with reporters. He has continued to criticize her in subsequent rallies, lumping her together with House Minority Leader Nancy Pelosi, a longtime target of Republican ire.
President Donald Trump bashed CNN for blaming it for "the current spate of Bombs" being mailed to top Democrats and prominent critics of his administration on Friday morning.
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The FBI has said at least five of the packages had a return address for the Florida office of US Representative Debbie Wasserman Schultz, a former chair of the Democratic National Committee. The devices, each with a small battery, were made from PVC pipe about 6in long and covered with black tape, said a law enforcement source who viewed X-ray images. Officials provided no details on a possible suspect or motive.
The visit comes as law enforcement officials scramble to find the perpetrator of the attempted bomb attacks against a slew of Democratic officials, including former President Barack Obama, Hillary Clinton and Rep. Maxine Waters, along with cable network CNN. It was addressed to former Central Intelligence Agency director John Brennan, who regularly appears as a television contributor and who has publicly clashed with Mr Trump.
Trump's supporters accused Democrats of unfairly suggesting the president was to blame for the bomb scare. The official didn't say whether the powder was explosive.
"I'm just really proud of law enforcement I think they did an incredible job", he added.
"Trump unleashed the dogs of hatred in this country from the day he declared he was running for president, and they've been snarling and barking at each other ever since", Gergen said.
Who got what, when: A timeline of when bombs found
And even though Trump refrained from mentioning Clinton, his crowd burst into a "Lock her up!" chant before he arrived. On Wednesday , a courier dropped off a package containing a suspicious device to at CNN's NY office.
The government also asked Furman to put all pretrial proceedings on hold, including the deposition of Acting Assistant Attorney General John Gore, noting that while the Supreme Court denied its request to stop that part of the case from going forward, two justices dissented from the order and said they would have postponed it.