The Florida man mailed bombs to Trump's critics and the media last year.
"A rational observer may have brushed off Trump’s tweets as hyperbole, but Mr. Sayoc took them to heart," his attorneys wrote.
"In October 2018, I made devices that were designed to look like pipe bombs and sent them in the mail," the Florida man said in court.
“I beg President Trump and others to refrain from talk of War with fellow Americans," wrote Cesar Sayoc's mother.
Package intercepted four days after president called the billionaire Democratic activist a "crazed and stumbling lunatic."
Like President Donald Trump, Fox News frequently offers up incendiary and sometimes false attacks on Democrats and other liberal figures.
The Facebook threats included photos of the Democratic Senate candidate's family.
Kathy Griffin criticized Twitter for allowing the suspected pipe bomber to stay on its platform.
It used to be all fun and games, this Florida Man stuff.
Hate showed what it is truly capable of in America this week.
"It's basically the white supremacists, the white foot soldiers that he wants to follow and lead," former boss Debra Gureghian said. "He wanted to be a leader."
President's son cranks up insulting rhetoric after bombs were mailed to his father's opponents.
The first lady said to #ChooseKind after authorities detained suspected mail bomber Cesar Sayoc, who was allegedly inspired by the president's violent rhetoric.
At a North Carolina rally, the president again attacked the news media hours after suspect Cesar Sayoc was arrested in connection with package bombs sent to Democratic public figures and CNN.
At a Wisconsin rally, Barack Obama said the president should be held accountable for his violent rhetoric against CNN, Hillary Clinton and others targeted by a suspected bomber.
All three Democrats were sent suspicious packages in the mail this week.
A Twitter account appearing to belong to Cesar Sayoc threatened Rochelle Ritchie: "Hug your loved ones real close every time you leave home.”
Many tweets feature prominent Democratic donor George Soros, the target of the first package allegedly linked to the mail bomb suspect.
On Friday, Police announced the arrest of Cesar Sayoc for the mail pipe bomb plot.