Over 9,000 Americans have signed a petition calling on 120 members who recently wrote letters of support to CAIR to renounce their backing, arguing that they cannot also be against racism.
"This political stunt gets us no closer to peace or justice. As a member of Congress, I consider it a non-starter," tweeted Tlaib.
Equating Zionism with white supremacy and implying that American Zionists (the vast majority of Jews) are complicit in supporting a racist state is antisemitic.
"He is no longer with the campaign and we wish him the best," Mike Casca, a campaign spokesman, told CNN.
This was far from the only controversial comment about Israel made at the event.
Speaking Friday at the annual conference of American Muslims for Palestine in Chicago, Sarsour had criticized progressive Zionists.
"We recruited both, Republicans and Democrats, but that's not good enough. We want to rule the White House," the Qataris allegedly said.
Palestinian-American activist Linda Sarsour, Harvard professor Cornell West and other BDS supporters are due to appear at a Nov. 12 event.
84 groups pen letter querying use of UMass name when departments host political events.
Zahr is a staunch advocate of the Boycott, Divestment and Sanctions (BDS) movement, and has campaigned against Israeli businesses in the US.