President Donald Trump said on Twitter Monday he will totally destroy and obliterate Turkeys economy if the country takes any action that he considers off limits after announcing U.S. forces will withdraw from Syria.

Trumps threat followed the White House announcing on Sunday that Turkey will invade Northern Syria in a campaign against the self-declared Islamic State. Republicans have since blasted this decision as a grave mistake and a disaster in the making.

The U.S. has done far more than anyone could have ever expected, including the capture of 100% of the ISIS Caliphate. It is time now for others in the region, some of great wealth, to protect their own territory, Trump added.

The White Houses decision has been widely criticized as jeopardizing the lives of U.S.-allied Kurdish forces by leaving them in the Kurdish-controlled region to fend for themselves. This comes after they helped the U.S. defeat the Islamic State in Syria.

The Kurds are considered to be a terrorist organization by the Turkish government. Withdrawing U.S. troops, therefore, places them at even greater risk, the Kurds Syrian Democratic Forces warned in a statement that accused the U.S. of abandoning its responsibilities in the war on terror.