Donald Trump has made one of the riskiest decisions of his presidency on Syria, even though it may not have registered with the average American. And even his allies are talking about it as though it’s a tragic mistake that will forever tarnish him.

Indeed, they are saying things that will make it rhetorically difficult to turn around and support him in 2020.

Trump’s intraparty critics have often been criticized for halfheartedly announcing their disapproval of the things Trump does. And that’s certainly still the case here. Rather than directly calling Trump out for his decision to pull troops from northern Syria — a move that is apparently paving the way for Turkey to target the United States’ Kurdish allies who led the fight against the Islamic State in Syria, and that some worry could revitalize it — they’ll often cite the “administration” or broadly express concern about the Kurds.

But even the things they are saying strongly suggest that the president they support will soon have blood on his hands. They’ll never say it in so many words, perhaps, but that’s really what they’re saying, for all intents and purposes.

“President Trump’s decision to withdraw U.S. forces from northern Syria is having sickening and predictable consequences,” Rep. Liz Cheney (Wyo.), the No. 3-ranking House Republican, said Wednesday. She added: “The U.S. is abandoning our ally the Kurds, who fought ISIS on the ground and helped protect the U.S. homeland. This decision aids America’s adversaries, Russia, Iran, and Turkey, and paves the way for a resurgence of ISIS.”

The derision extends to Trump’s most devoted base, evangelical Christians. The Rev. Franklin Graham echoed what many evangelicals have been saying Wednesday: “The Kurds are the ones who have been leading the fight against ISIS in Syria. Also pray for the Christians who the Kurds have been protecting. They could be annihilated. Would you pray w/me that Pres. ⁦‪@realDonaldTrump‬⁩ will reconsider? Thousands of lives hang in the balance.”

Sen. Ben Sasse (R-Neb.) warned Monday, “If the President sticks with this retreat, he needs to know that this bad decision will likely result in the slaughter of allies who fought with us, including women and children.”

Sen. Marco Rubio (R-Fla.) said via Twitter that the “administration” had “cut [a] deal with Erdogan allowing him to wipe [the Kurds] out.” He added that “this is not a matter of if many ISIS fighters break out, it’s a matter of when.”

So Trump cut a deal that will lead to mass death, and terrorists will be freed, at which point they can target the West. Rubio didn’t say Trump, but he said a lot.

Some of these politicians might dress it up, but what they’re saying, strictly speaking, is that Trump has made a decision that could well lead to a mass slaughter of U.S. allies and also increase the threat from the most dangerous terrorist organization in the world. They’re saying that people will die, perhaps en masse, and that Trump’s decision increases the danger to the Western world and Americans.

Even Trump seemed to concede the latter point Wednesday, suggesting that Islamic State fighters might go to Europe.

“Well, they’re going to be escaping to Europe; that’s where they want to go,” he said. “They want to go back to their homes, but Europe didn’t want them from us.”

If it happens — or if the dire predictions about the Kurds come true — how can Republicans then turn around and say Trump is the steady leader this country needs? How can they argue that “socialism” is worse than an increased terrorist threat and/or the mass death of U.S. allies whom they said Trump, practically speaking, sent to their own slaughter? Most of them still probably would, almost certainly, but that argument would carry significant cognitive dissonance. The quotes above would certainly loom large in Democratic arguments that Trump has proved to be genuinely dangerous.

To this point in his presidency, despite his many controversies, Trump has avoided a true catastrophe involving massive loss of life that can be directly chalked up to the federal government. Whatever you think of this decision, he has walked into a scenario in which that could well be the case — and even his allies are predicting it pretty unmistakably.