Trump condemns 'political violence,' calls for national unity

President TrumpDonald John TrumpDem lawmaker says Electoral College was 'conceived' as way to perpetuate slavery Stanley Cup champion Washington Capitals to visit White House on Monday Transportation Dept requests formal audit of Boeing 737 Max certification MORE on Wednesday condemned "acts or threats of political violence” and called for unity after suspicious packages were mailed to a number of prominent Democratic officials.

"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 United States of America,” Trump said at a White House event where he signed an anti-opioid addiction bill into law.

Trump offered his first in-person comments since authorities intercepted explosive devices addressed to former President Barack ObamaBarack Hussein ObamaWhatever happened to nuclear abolition? On The Money: Trump presses GM, union to start talks over closed plant | Trump renews call to cut arts, PBS funding | Alan Krueger, former Obama economic adviser, dies at 58 | Americans expected to bet .5B on March Madness Obama reminisces about visit to Ireland on St. Patrick's Day: 'It'll always be O'Bama' MORE, Bill and Hillary ClintonHillary Diane Rodham ClintonDem lawmaker says Electoral College was 'conceived' as way to perpetuate slavery Dem strategist says Donna Brazile is joining Fox News 'for the money' CNN to host town hall with Cory Booker in South Carolina MORE, former CIA Director John BrennanJohn Owen BrennanEx-CIA director: 'I don't have any doubt' Trump will pardon Manafort Senate Dems request probe of White House security clearances Brennan calls light Manafort sentence 'extraordinarily lenient' in light of crimes committed MORE and former Attorney General Eric HolderEric Himpton HolderThe Hill's 12:30 Report: Trump steps up attacks on McCain Court-packing becomes new litmus test on left Press: Which way do Dems go in 2020? MORE. Another suspicious package addressed to Rep. Maxine WatersMaxine Moore WatersDems concerned impeachment will make Trump 'appear like a victim,' says pollster Trump calls Biden 'low I.Q. individual' after verbal slip On The Money: Senate rejects border declaration in rebuke to Trump | Dems press Mnuchin on Trump tax returns | Waters says Wells Fargo should fire its CEO MORE (D-Calif.) was also intercepted by police.

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Trump has explicitly criticized each individual throughout his presidency, but did not mention any of them by name when discussing Wednesday's threats.

The president also did not address criticism that he has helped contribute to the toxic political environment in the U.S.

Trump decried the acts as "egregious" and "abhorrent to everything we hold dear and sacred as Americans." A "major federal investigation" is underway, the president said.

"We are extremely angry, upset, unhappy about what we witnessed this morning and we will get to the bottom of it," Trump said.

The Department of Justice, FBI, Department of Homeland Security and Secret Service have all briefed the president on the matter, he said.

Trump stopped short, however, of labeling the suspicious packages as part of an act of "domestic terrorism," as FBI officials and top Republican lawmakers have done. 

Before Trump spoke, first lady Melania TrumpMelania TrumpThe Hill's 12:30 Report: Trump steps up attacks on McCain White House announces spring garden tour dates Trump heard sermon on calling out hate speech at St. Patrick's day church service MORE denounced the "cowardly attacks" and "those who choose violence."

"I’m grateful to the Secret Service as well as federal and local law enforcement for all they do on a daily basis to keep us safe, and encourage people across the country to choose kindness over hatred," she said.

The Secret Service said it intercepted explosive devices earlier Wednesday that were addressed to Obama, as well as Hillary and Bill ClintonWilliam (Bill) Jefferson ClintonHill-HarrisX poll: 76 percent oppose Trump pardoning former campaign aides A Weld challenge to Trump would provide Republicans a clear choice History teaches that Nancy Pelosi is right about impeachment MORE.

Authorities in New York City discovered an explosive device mailed to the offices of CNN. The package was addressed to Brennan, who is actually a contributor to NBC News and MSNBC. 

Capitol Police later in the day said they had intercepted a suspicious package mailed to Rep. Maxine Waters (D-Calif.), one of Trump's most vocal critics on Capitol Hill.

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 has been the subject of conspiracy theories pushed by far-right figures and some conservative politicians.

Republican and Democratic lawmakers alike were quick to condemn the threats, but some of the president's critics argued he has done more to inflame – rather than heal – the nation's political divisions. 
 
Trump has labeled Democrats an "angry mob" who pose a danger to the country, pointing to protests against Supreme Court Justice Brett KavanaughBrett Michael KavanaughCourt-packing becomes new litmus test on left Warren, Harris, Gillibrand back efforts to add justices to Supreme Court Pence traveling to SC for Graham reelection launch MORE and harassment of GOP lawmakers and administration officials at restaurants and on the street. 
 
 
CNN President Jeff Zucker tore into Trump and the White House after the president spoke, saying they have a "total and complete lack of understanding" of "the seriousness of their continued attacks on the media."

"Their words matter. Thus far, they have shown no comprehension of that," Zucker said in a statement.
 
Trump is scheduled to fly Wednesday evening to Wisconsin on for a rally in support of Gov. Scott Walker (R) and Senate candidate Leah Vukmir (R). The president's campaign rallies often turn raucous, with Trump fiercely railing against the media and Democrats. Attendees regularly respond with chants of "CNN sucks" and "lock her up," the latter a reference to Hillary Clinton.
 
Prior to Wednesday's White House event, Trump had tweeted that he "wholeheartedly" agreed with Vice President Pence’s denunciation of the threats.