Two U.S. senators and the head of the Germany’s Jewish community called on German officials representing the country’s German-Iranian parliamentary group to cancel a scheduled visit to Iran on Oct. 27.

According to Bijan Djir-Sarai of the pro-business Free Democratic party, the officials plan to meet with the German-Iranian chamber of commerce and Mohammad Javad Larijani, the head of the Iranian human rights council. This has been scheduled despite the fact that Iran is known to “brutally represses and murders opposition,” said Dieter Graumann, the president of the Central Council of Jews in Germany.

“At this particularly sensitive juncture in diplomatic relations, the international community needs to continue to send a clear, unified message to Tehran as we pressure the regime to come to the negotiating table. A formal visit at this time—no matter how well-intentioned—is counterproductive and undermines our joint efforts to put an end to Iran’s nuclear ambitions,” wrote U.S. Sen. Jeanne Shaheen (D-NH) in an email to the Jerusalem Post on Tuesday.

The trip to Iran “is a brazen piece of being on the wrong political and moral way, that of all things to visit a regime that continues to build its nuclear program and threatens the destruction of Israel and continues to deny the Holocaust,” Graumann said. Senator Ben Cardin (D-MD) also wrote that “sending a delegation to Iran sends the wrong message.”