According to Ashoora news from Mehr news:
In a Twitter message on Saturday evening, Democratic Senator Bernie Sanders of Vermont and Joe Biden's former rival in the Democratic primary reacted to the assassination of "Mohsen Fakhrizadeh", a prominent Iranian nuclear scientist.
“The assassination of Mohsen Fakhri Zadeh was reckless, provocative, and illegal”, he said.
“As a new administration takes power, it was clearly intended to undermine US-Iran diplomacy,” he claimed, adding, “We must not allow that to happen.”
“Diplomacy, not murder, is the best path forward,” he added.
Fakhrizadeh-Mahavadi was targeted on Friday in a multi-pronged attack involving at least one explosion and small fire by a number of assailants in Absard city of Damavand County, Tehran province.