Suspected pipe bombs have been sent to all three of them, and at least five others, all of whom have criticized Trump and been criticized by him. Republicans derided protesters for disrupting GOP lawmakers or Trump officials at restaurants or other public places.
Native American Trump supporter Ceasar Sayoc was named as the pipe bomb mailer suspect that was arrested in Florida today.
The latest targets of the fugitive plotter or plotters fit neatly with the list of previous recipients: New Jersey Democrat Booker is a frequent critic of President Trump, while Clapper was a member of the Obama administration. Obama and Clinton were not at risk, they said.
From assassinations of presidents and other elected officials, to the murder of movement activists such as Martin Luther King Jr.to the violence committed against African-Americans in the Jim Crow South, to the white nationalists who blew up the federal government building in Oklahoma in 1995, we are a country that seen its share of these very bad acts. But his narrative was interrupted rudely this week by a much more tangible threat - the discovery of explosive devices sent from inside the United States homeland.
Photographs circulating on social media showed what appeared to be the same van that was taken from the scene, identifiable by some of the same stickers. "It's called peacefully at the ballot box", Trump said while reading from the teleprompter.
The crowd also erupted into a familiar "Lock her up!" chant directed at Clinton, Trump's 2016 rival.
A package addressed to former vice president Joe Biden is also being investigated after it was intercepted at a DE mail centre.
The pipe bomb addressed to Brennan was found in the mail at CNN's headquarters in NY.
Authorities acknowledged that some of the packages were sent from Florida.
But Democratic Senate and House leaders Chuck Schumer of NY and Nancy Pelosi of California said such words "ring hollow" when coming from Trump.
"Now this "Bomb" stuff happens and the momentum greatly slows - news not talking politics".
Most of those targeted were past or present US officials, but one was sent to actor Robert De Niro and billionaire George Soros.
"When the ACA guaranteed insurance to people with pre-existing conditions premiums did go up especially for people who are healthy", he said.
"There's something more powerful than bombs, and that's your vote".
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. "They originated, some of them, from Florida", Homeland Security Secretary Kirstjen Nielsen confirmed during an interview on Fox News Channel. However, he heard that the suspect was someone who "preferred me over others".
All of the targets are frequently maligned by right-wing critics. Debbie Wasserman Schultz, whose return address was on it. They later cited police who said it was a cell phone.
On Thursday, the investigation widened with the discovery of three additional packages.
Although De Niro is an actor, not a politician, he has been a prominent critic of Mr. Trump.
None of the eight packages detonated, and nobody was hurt. The official didn't say whether the powder was explosive.
Investigators have declined to say whether the devices were built to be functional.
The envelopes, only a few inches long, had typed letters and six stamps that bore no cancellation mark.
The attacks overtook other news in an already-tense political season that could reshape Congress and serve as a referendum on the first two years of Mr Trump's presidency.