Sam Brownback, the former U.S. ambassador at large for international religious freedom and a former GOP senator, warned Wednesday that, unless Syrian minority groups are allowed to maintain their own security forces, they face a likely genocide by government-aligned forces.

The stark warning is a repudiation of the policies of the new Syrian government led by President Ahmad al-Sharaa, which had pushed for full integration of minority-led forces into the Syrian military and most recently launched a military offensive against the Kurdish-led and U.S.-backed Syrian Defense Forces, largely forcing a Kurdish surrender.

Forces aligned with the Syrian government have also carried out massacres of Druze, Alawite and Christian minorities since al-Sharaa’s rise.

The Trump administration has remained largely supportive of the al-Sharaa government, even as critics have accused it of essentially abandoning the U.S.’ longtime Kurdish allies to the Syrian government onslaught.

“The new administration in Syria is purging religious minorities, threatening and killing them,” Brownback said at a hearing of the House Foreign Affairs Committee. “These groups must be allowed to maintain their own security forces, or I guarantee you today, a genocide will happen in Syria like happened in Iraq to the Yazidis and Christians.”

Brownback urged the U.S. to pressure the Syrian government to change course.

“One Syria — not talking about breaking Syria — but the people there, the Druze, the Alawites and Christians, have to be able to provide their own security,” he said. “The Kurds are our best allies. We’ve got to keep standing with the Kurds. They will protect religious minorities and they need to be able to have their own security.”

Rep. Bill Huizenga (R-MI), who questioned Brownback on the issue, said that he and “many” of his colleagues “struggled” with the idea of repealing the Caesar Civilian Protection Act, the last major sanctions targeting Syria, but ultimately did so on the promise of continued congressional oversight.

In the Senate, a bipartisan pair of lawmakers is pushing to reverse course and re-institute sanctions in response to the attack on the Kurds..

Brownback also warned that there are “early warning signs of a Muslim-on-Christian war … brewing across Africa,” and that the U.S. needs to get out ahead of it. He pointed to Nigeria as a starting point of this conflict, with its government backed by China, Russia, Turkey and Saudi Arabia engaging in persecution of Christians.

Rep. Joaquin Castro (D-TX) accused the Trump administration, and colleagues on the Hill, of turning a blind eye to what he described as attacks on the Christian community in “Palestine, including Jerusalem” by Israeli government forces and Israeli settlers.