Around 200 people demonstrated against President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE's visit to Pittsburgh on Tuesday afternoon.

The protesters, organized by Jewish group IfNotNow, staged a gathering that was part-protest and part-shiva, a Jewish mourning ritual, BuzzFeed News reported.

The demonstration came as Trump traveled to meet with victims and families of those affected by the mass shooting Saturday at the Tree of Life synagogue in Squirrel Hill.

The shooting, which left 11 dead and several others injured, is believed to be the deadliest attack against Jewish people in U.S. history, according to the Anti-Defamation League.

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Pittsburgh young Jews are leading a coalition to join with @bendthearcpgh to say loud & clear together:#NotThisTime.



We will not be political props for white nationalists.



We will #EndWhiteNationalism.



Watch & Share: https://t.co/H32bx49NpN pic.twitter.com/FZ4HM5NiyN — IfNotNow (@IfNotNowOrg) October 30, 2018

"Today, President Trump is in Pittsburgh," IfNotNow tweeted. "We do not need him. We stand with each other and mourn for our dead, and show up to protect each other."

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Trump's Tuesday visit to Pittsburgh has been met with some pushback, including from city public officials who say they are focused on the first funerals for victims of the shooting.

Pittsburgh Mayor Bill Peduto (D) declined to appear with Trump during his visit, saying “all attention [Tuesday] should be on the victims.”

The protesters, donned in black clothes, marched as they held signs reading "anti-Semitism upholds white supremacy," "your words have consequences" and more. At one point, they paused to sing the Mourner's Kaddish, a Jewish prayer commemorating the dead.

At a protest/Shiva organized by @IfNotNow in #Pittsburgh, they’re reciting the mourner’s Kaddish, and singing Ozi V’Zimrat Yah. pic.twitter.com/SAnbDgPMry — Christopher Mathias (@letsgomathias) October 30, 2018

As of Tuesday evening, more than 77,000 people had signed an open letter from progressive Jewish leaders saying Trump was not welcome in Pittsburgh until he denounces white nationalism.

Eleven members of the Pittsburgh affiliate of Bend the Arc: A Jewish Partnership for Justice penned the letter to Trump following Saturday's shooting at the Tree of Life synagogue.

The suspect in the shooting, Robert Bowers, made his first court appearance Monday. He faces 29 federal counts, including hate crime charges, after reportedly making anti-Semitic comments before he allegedly opened fire.

“Our Jewish community is not the only group you have targeted,” the group wrote in its letter. “You have also deliberately undermined the safety of people of color, Muslims, LGBTQ people, and people with disabilities. Yesterday’s massacre is not the first act of terror you incited against a minority group in our country.”