The Palestinian-rights group whose members posed with Sen. Cory Booker holding an anti-Israel sign are disputing the New Jersey Democrat’s insistence that he was unaware the sign had anything to do with the Jewish state.

The sign says “From Palestine to Mexico, All the Walls Have Got to Go.”

Booker held the sign as he posed for a photo with members of the U.S. Campaign for Palestinian Rights (USCPR) at the Netroots Nation conference last Friday.

Booker’s spokesman, Jeff Giertz, said the senator “didn’t have time to read the sign,” the Jewish Telegraphic Agency reported.

“From his cursory glance he thought it was talking about Mexico and didn’t realize it had anything to do with Israel,” Giertz said.

But the Palestinian group later told The Intercept that Booker must have known what the sign said because they spoke to him prior to taking the photo.

USCPR said it was in this “overwhelmingly supportive environment at Netroots Nation that our contingent had the opportunity to meet Sen. Cory Booker briefly and discuss our work for freedom, justice, and equality for the Palestinian people before posing for a photo with him.”

When the photo first appeared on Twitter, the Simon Wiesenthal Center responded by pointing out that Israeli’s security fence for has “successfully halted suicide bombers.”

The Jewish group asked the senator to clarify his stance on the Boycott, Divestment and Sanctions movement against Israel.

“We understand that the senator does not fully grasp what the sign said, but he is a leading American political figure who has been touted as a future President of our nation,” the Simon Wiesenthal Center said in a statement.

The Jewish Telegraph Agency noted Booker that while Booker had taken money from and spoke in front of pro-Israel groups, he recently has has taken opposing stances on the Iran nuclear deal, the Taylor Force Act penalizing the Palestinian Authority for paying terrorists and a bill that prevents American companies from engaging in the BDS movement.

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