U.S. Rep. Doug Lamborn from Colorado Springs has been one of President Trump’s most reliable allies, but now he’s taking steps to intervene in the conflict unleashed when his fellow Republican in the White House pulled U.S. troops out of Syria two weeks ago.

The withdrawal left the American-allied Kurds to fend for themselves against Turkey.

Lamborn is a co-sponsor of H.R. 4695, the PACT Act for Protect Against Conflict by Turkey, as well as H.R. 4692 to impose sanctions on the Turks “for their unprovoked aggression against our Syrian Defense Forces (SDF) partners,” Lamborn’s office said Monday morning. The latter sanctions bill was introduced last week by Republican Rep. Liz Cheney of Wyoming, the daughter of former Vice President Dick Cheney. 

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Lamborn said in the statement Monday that he’s hopeful the temporary ceasefire negotiated by Vice President Mike Pence can hold, though he remains concerned about the stability of the region.

In December Lamborn signed a bipartisan letter to Trump urging him to use caution in withdrawing from northern Syria.

“Our Kurdish partners, fighting alongside American forces, spearheaded the fight against ISIS and Islamic fascism,” Lamborn said Monday. “Our joint efforts concluded with the collapse of the Islamic State in Syria.”

Lamborn’s statement is a clear break with the president, who has said the Kurds are “no angels” and, “They have a problem with Turkey, they have a problem at a border. It’s not our border.” Trump also has said, “I captured ISIS.”

Lamborn said Monday he shared the president’s goal to stay out of “endless foreign wars,” but not his hasty withdrawal from Syria.

He said, “[A] premature withdrawal from Syria could sow chaos and severely hamper our ability to shape events on the ground in a manner favorable to the U.S.”

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Lamborn continued: “I fear that, in a worst-case scenario, the Turks turn a blind eye to Islamist factions within the Free Syrian Army and the region becomes an incubator once again for radical Islamic terrorism. I also have concerns about how trustworthy [Turkish] President [Recep Tayyip] Erdogan is. I am glad the United States Congress has put politics aside and come together to sanction the Turkish government for their attacks against the SDF. I was especially pleased to see the Democrats speak out after remaining silent during the Obama administration while 400,000 Syrians were killed.”

Lamborn then sought to smooth over his criticism of the president’s foreign policy decision by saying he would continue working with Trump “to ensure our focus remains on the security of our homeland and our core national interests, as detailed in his excellent National Defense Strategy.”