She noted that Tree of Life synagogue's rabbi, Jeffrey Myers, has said that Trump is "welcome" to visit. "The very first thing the media did was blame the president and make him responsible for these ridiculous acts".
Speaking at a rally in Murphysboro, Ill., Saturday, Trump said the "evil Anti-Semitic attack is an assault on all of us, it's an assault on humanity".
"President Trump, you are not welcome in Pittsburgh until you fully denounce white nationalism", Bend the Arc said in the letter, which now has more than 43,000 signatures.
CNN President Jeff Zucker said another suspicious package addressed to CNN was intercepted Monday at an Atlanta post office.
He skirted any responsibility for fuelling the anti-Semitism that motivated the attack, instead blaming the media for "the division and hatred" engulfing the US.
When Acosta asked Sanders for a list of media outlets that Trump considers the enemy, she refused, saying, "Those individuals probably know who they are".
If the president still decides to visit Pittsburgh without meeting the letter's demands, Friedman said he expects Trump will "only be met with derision".
Police say the shooter told them he hated Jews because they were "committing genocide to his people".
But it didn't take long before Sanders was criticizing the press for highlighting Trump's harsh rhetoric on the campaign trail in the run up to the midterm elections.
ABC's Jonathan Karl specifically asked Sanders whether the president's words could "inspire or provoke troubled people to do bad things".
Sanders rejected the notion Trump has blamed the media for recent violence.
An investigation by Politico has found that President Donald Trump's "executive time" - which is used by the White House as a euphemism for the time he spends watching cable news - absolutely dwarfs the time allotted to doing official work. Trump critics have said the president's harsh partisan rhetoric has fueled such attacks.
One of the targets of the mail bomb attacks last week was liberal Jewish philanthropist George Soros, who has been accused by far-right conspiracy theorists of paying migrants to join the caravan. "That is outrageous that that would be the very first reaction of so many people across this country".
"Our investigation of these hate crimes continues", said U.S. Attorney Scott Brady in a Monday statement.
"We turn to the leaders of our country", Myers also said in an AP interview.
Barry Werber says members of the synagogue's New Light Congregation were in the basement and beginning to pray when they heard crashing coming from upstairs.
"I think he would cause more strife, ill feeling, and sadness", Cecil Sharpe, 92, a long-time Squirrel Hill resident said before the White House announcement.