"Let's get along", he said.
"As you know the suspect has been captured - great job - and is now in federal custody", Trump said as crowds waved signs behind them.
Other officials said the devices contained in the envelopes were all similar to one found in the mailbox of the Soros home and later detonated by police.
The White House has condemned the attempted attacks, saying investigations are underway.
"Any acts or threats of political violence are an attack on our democracy itself", Trump said.
"This egregious conduct is abhorrent to everything we hold dear and sacred as Americans", he added. They said it was similar to other explosives discovered in the past few days.
But Democratic Senate and House leaders Chuck Schumer of NY and Nancy Pelosi of California said such words "ring hollow" when coming from Trump.
Another suspicious package resulted in the evacuation of the office of Florida US Representative Debbie Wasserman Schultz.
The packages addressed to Obama and Clinton were meant to arrive at their residences. The devices were discovered by technicians who screen mail sent to the former United States officials.
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The widespread mailing of suspected bombs to top officials and a news organization has little precedent in USA history, but resembles terrorism with its seemingly political bent.
Police in New Castle, New York who cover Chappaqua say they assisted the FBI, Secret Service and Westchester County authorities in "the investigation of a suspicious package".
"Early this morning, October 24, 2018, a second package addressed to Former President Barack Obama was intercepted by Secret Service personnel in Washington, DC", the Secret Service said in a statement.
In addition, CNN's New York City studio was evacuated Wednesday morning due to a suspicious package being found.
Clinton was among the frequent Trump targets sent pipe bombs this week. Most famously, De Niro said "F-k Trump" at the Tony Awards, after which our commander in chief fired back by calling the actor "a very low IQ individual".
The package contained a live explosive and an envelope with white powder and the substance was being tested to see if it was risky, authorities said. Officials claim that it was a functional explosive.
"Everyone will benefit if we can end the politics of personal destruction", Trump said. All of the packages were sent through the US mail system.