I recently met with President-elect Donald Trump to give voice to the millions of Americans, including my fellow veterans, who desperately want to end our country’s illegal, counterproductive war to overthrow the Syrian government. We had an hour-long, meaningful, back-and-forth discussion about the problems with current US policy in Syria and where to go from here.

I felt it critical to meet with him now, before warmongering neocons convince him to escalate this war that has already taken more than 400,000 lives and left millions of Syrians homeless and in search of safety for themselves and their families.

I conveyed to the president-elect how the post-9/11 neocon agenda of interventionism and regime change has left US foreign policy absurdly disconnected from our actual security interests. Our actions to overthrow secular dictators in Iraq and Libya, and attempts now to do the same in Syria, have resulted in tremendous loss of life, failed nations, and even worse humanitarian crises while strengthening the very terrorist organizations that have declared war on America.

Since 2011, the United States—working with Saudi Arabia, the Gulf States, and Turkey—has been providing support to “rebel groups” fighting to overthrow the government and take over Syria. A recent New York Times article reported that these “rebel groups” supported by the United States “have entered into battlefield alliances with the affiliate of Al Qaeda in Syria, formerly known as Al Nusra.” How the United States can work hand-in-hand with the very terrorist organization that is responsible for the killing of 3,000 Americans on 9/11 boggles my mind and curdles my blood.

This absurd alliance has allowed terrorist groups like Al Qaeda to establish strongholds throughout Syria, including in Aleppo, where they are now using the civilian population as human shields and their deaths as propaganda tools.

Additionally, escalating this regime-change war by implementing a “no-fly/safe zone” in Syria would not only be ineffective, it would put the United States in direct military confrontation with nuclear-power Russia, require tens of thousands of ground troops and a massive US air presence, and commit us to yet another endless war in the Middle East that does not serve American or Syrian interests.

In short, even if the US-Saudi alliance were successful in overthrowing the Syrian government, we would be saddled with the responsibility of building a new nation in Syria. Trillions of US taxpayer dollars, and who knows how many American lives, will be lost, and there will be little to show for it. As was true in Iraq and Libya, the United States has no credible government or leader able to bring order, security, and freedom to the people of Syria if Assad is overthrown. To maintain order after Assad’s fall would require at least 500,000 troops in a never-ending occupation.

The most likely outcome of this regime-change war is that it will open the door for ISIS, Al Qaeda, and other terrorist groups who are the most powerful fighting forces on the ground, to take over all of Syria, amass powerful weapons (many of which will have been provided to them by the United States), and pose a far worse threat to the Syrian people, religious minorities, and to the world.

The crux of my advice to President-elect Trump was this: We must end this ill-conceived, counterproductive regime-change war immediately. We must focus our precious resources on investing in and rebuilding our own country and on defeating Al Qaeda, ISIS, and other terrorist groups that pose a threat to the American people.