Donald Trump attends a memorial event.
"The very first thing the media did was blame the president and make him responsible for these ridiculous acts", Sanders said.
Jewish leaders in Pittsburgh, however, said Trump isn't welcome unless he stops targeting minorities and denounces white nationalism.
"President Trump, you are not welcome in Pittsburgh until you commit yourself to compassionate, democratic policies that recognize the dignity of all of us", reads an open letter from the Pittsburgh chapter of Bend the Arc: A Jewish Partnership for Justice.
Last year, after a deadly neo-Nazi rally in Charlottesville, Virginia, the USA president said there were "some very fine people" amongst both the violent white nationalists and counter-protesters. His media attacks are a central feature of his rallies and nearly always whip up the crowd.
Sanders shut down the CNN reporter's request, spurring Acosta to ask her whether the "fake news" list includes "my outlet, which received the bomb last week?"
Sanders announced that Mr. Trump and first lady Melania Trump would visit Pennsylvania to grieve with the Pittsburgh community Tuesday.
She said: "I think it's irresponsible of a news organisation like yours to blame responsibility of a pipe bomb that was not sent by the president - not just blame the president but blame members of his administration for those heinous acts".
With eight days to go before the midterm elections, Trump has continued to hold his political rallies, complete with harsh criticism of Democrats and the media. "And hopefully this feeling of community that we all share today can be channelled into each of us doing our part of rooting out hate".
The mail bomb attacks and the bloodshed in Pittsburgh set off debate over whether the corrosive political rhetoric in Washington and beyond contributed to the violence and whether Trump himself bears any blame.
Progressive Jewish leaders have called on the president to soften his tone in an open letter that now has almost 40,000 signatures.
"The president's going to continue to fight back", Sanders said.
A gunman who expressed hatred of Jews exploited a vulnerability common in so many houses of worship across the country - doors that are unlocked for worship - to target a Pittsburgh synagogue. "Blowback from his words came and cost people's lives, and we said enough is enough".
U.S. Attorney Scott Brady says federal prosecutors intend to pursue the death penalty.
But Sanders vigorously rejects any notion the President condones rhetoric or actions against Jews.
"I don't think it's necessarily specific to a general, broad generalization of a full outlet", Sanders explained.
Rabbi Jonathan Perlman closed the door and pushed them into a large supply closet, he said.