A mourner wearing a Star of David around his neck at the Squirrel Hill memorial service for the victims of the shooting at the neighborhood’s Tree of Life synagogue in Pittsburgh, Penn., Oct. 29, 2018. (Matthew Hatcher/SOPA Images/LightRocket via Getty...

Mourners seen holding candles in the aftermath of the mass shooting at the Tree of Life Synagogue in Squirrel Hill, Pittsburgh, on Oct. 27, 2018. The shooter espoused an anti-immigrant and anti-Semitic ideology online. (Aaron Jackendoff/SOPA Images/LightRocket...