Biden on bomb threats: 'This ugliness has to end'
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Former Vice President Joe BidenJoseph (Joe) Robinette Biden2020 Democrats barnstorm the country for MLK weekend BuzzFeed story has more to say about media than the president Kamala Harris picks Baltimore as headquarters for potential 2020 campaign: report MORE on Wednesday called for an end to "division," "hatred" and "ugliness" as Democratic leaders denounced suspected explosive devices mailed to a number of prominent party members including former President Obama.

"This country has to come together. This division, this hatred, this ugliness has to end," Biden wrote on Twitter.

Biden joined a chorus of national Democrats and potential 2020 presidential candidates who spoke out forcefully against the threats against public officials.

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Sen. Elizabeth WarrenElizabeth Ann WarrenIdentity politics and the race for the Democratic nomination O'Rourke’s strategy: Show Americans the real Beto 2020 Democrats barnstorm the country for MLK weekend MORE (D-Mass.) thanked law enforcement and warned that such violence "has no place in our democracy."

Sen. Bernie SandersBernard (Bernie) SandersIdentity politics and the race for the Democratic nomination 2020 Democrats barnstorm the country for MLK weekend Bill Maher defends Bernie Sanders campaign over sexual harassment allegations MORE (I-Vt.), another potential 2020 candidate, echoed Warren's message and called the threats "deeply disturbing."

"In this country we battle with words and ideas, not fists and bombs," he tweeted. "Acts of violence, appeals to violence and condoning violence have no place in American society."

Sen. Cory BookerCory Anthony BookerJimmy Carter tells Booker: 'I hope you run for president' Identity politics and the race for the Democratic nomination 2020 Democrats barnstorm the country for MLK weekend MORE (D-N.J.) decried the packages as "targeted acts of terror" that showed "despicable cowardice."

The Secret Service said it intercepted explosive devices earlier Wednesday that were addressed to Obama in Washington, D.C., as well as another for Hillary and Bill Clinton the previous day in New York.

Hillary ClintonHillary Diane Rodham ClintonIdentity politics and the race for the Democratic nomination O'Rourke’s strategy: Show Americans the real Beto Conservatives pound BuzzFeed, media over Cohen report MORE addressed the bomb threat during a stop in Florida on Wednesday to support gubernatorial candidate Andrew Gillum (D). She lamented the "deep divisions" in politics, and urged Americans to "do everything we can to bring the country together." 

"We also have to elect candidates who will try to do the same," she added.

Bill ClintonWilliam (Bill) Jefferson ClintonBuzzFeed story has more to say about media than the president Agency function is tied to how people feel about their job — that's bad news for USDA research 5 myths about William Barr MORE later thanked law enforcement for its efforts.

Authorities also responded on Wednesday after a suspicious device was mailed to the New York offices of CNN.

The package was addressed to former CIA Director John BrennanJohn Owen BrennanBrennan calls on Congress to end shutdown before negotiating border security: Not 'subservient' to the president Washington’s reflexive opposition to Trump on Syria Brennan hopes GOP abandons Trump in 2019 over 'malfeasance, corruption' MORE, who appears occasionally on the network but works as a contributor for MSNBC.

Capitol Police later in the day said they had intercepted a suspicious package mailed to Rep. Maxine WatersMaxine Moore WatersBuzzFeed story has more to say about media than the president New progressive sheriffs in town ready to fight for Main Street On The Money: Shutdown Day 27 | Trump fires back at Pelosi by canceling her foreign travel | Dems blast 'petty' move | Trump also cancels delegation to Davos | House votes to disapprove of Trump lifting Russia sanction MORE (D-Calif.), one of Trump's most vocal critics on Capitol Hill.

Former Attorney General Eric HolderEric Himpton HolderHolder: If Trump directed Cohen to lie, impeachment proceedings ‘must begin’ William Barr's only 'flaw' is that he was nominated by Trump Protecting voices of all voters is critical to free and fair elections MORE was also the addressee on a similar package, though it was sent to the wrong address.

A similar device was discovered in the mailbox at the home of billionaire philanthropist George Soros late Monday. Soros is an ardent supporter of liberal causes and Democratic politicians, and is the subject of conspiracy theories pushed by some conservative figures.

President TrumpDonald John TrumpDACA recipient claims Trump is holding ‘immigrant youth hostage’ amid quest for wall Lady Gaga blasts Pence as ‘worst representation of what it means to be Christian’ We have a long history of disrespecting Native Americans and denying their humanity MORE on Wednesday afternoon called the attacks "egregious" and "abhorrent to everything we hold dear and sacred as Americans." He called for national unity, and said a "major federal investigation" is underway.

"I just want to tell you that in these times, we have to unify. We have to come together and send one very clear, strong unmistakable message that acts or threats of political violence of any kind have no place in the Untied States of America,” Trump said at a White House event where he signed an anti-opioid addiction bill into law.

Some critics have suggested the president has inflamed political divisions by labeling Democrats an "angry mob" and attacking CNN and other outlets as the "enemy of the people."

Republicans and Democrats have been quick to condemn the suspicious packages this week and have called for cooler heads to prevail.