Two Palestinian activists from Masafer Yatta in the West Bank were prevented from entering the U.S. upon arrival in San Francisco on Wednesday, after U.S. officials invalidated their visas.

Eid Suleiman Hadaleen and Awdah Hathaleen, who were traveling to the U.S. to speak to progressive Jewish synagogues and organizations, now stand to be deported.

While the Trump administration has made its crackdown on pro-Palestinian student visa holders a central component of its attack on immigration and universities, this would appear to be the first case of Palestinian activists being denied entry into the U.S. on political grounds.

It further comes at a time where the Trump administration explicitly distances itself from potentially recognizing a Palestinian state, with U.S. Ambassador to Israel Mike Huckabee effectively disavowing longstanding U.S. policy and the U.S. warning foreign countries not to participate in next week's French-Saudi conference at the United Nations about a two-state solution.

The activists from the village of Umm al-Khair were entering the U.S. as part of an interfaith program, with their visas sponsored by the Kehilla Community Synagogue in Piedmont, California. They were slated to discuss the plight facing the region, which was spotlighted in this year's Oscar-winning documentary “No Other Land.”

“They were coming here to do a speaker tour in the Bay Area, Boston and Washington, DC,” said Ben Linder, co-chair of J Street Silicon Valley, who organized an event scheduled for Thursday night at the Los Altos United Methodist Church. “We have four different events in the San Francisco Bay Area in the next 48 hours that they were supposed to speak at.”

Linder said J Street contacted three local congressmen to try and find a solution. “They were detained inside the San Francisco airport yesterday,” he said. “They arrived from Qatar. Their visas were very valid. Their U.S. tourist visas were invalidated by the Customs and Border Patrol. They are being held and not allowed to communicate, and they will be deported today back to Qatar.”

The U.S. Customs and Border Protection did not respond to Haaretz’s request for comment.