Erdogan warned European leaders they should "revise their stances" toward Turkey, where scores of the militants are imprisoned.
Studies of leadership decapitation suggest groups like ISIS often find ways to survive.
The House speaker demanded that the White House brief lawmakers on the operation, which led to the death of the ISIS leader.
In the graphic account of the so-called Islamic State leader's death, the president described him as having been "whimpering and crying and screaming.”
President Trump said he didn't alert "some" congressional leaders ahead of the U.S. operation that killed ISIS leader Abu Bakr al-Baghdadi.
His death is a major blow, but the extremist group has survived the loss of previous leaders and military setbacks.
"He died like a dog," President Trump said during a news conference announcing the extremist leader's death.
The former defense secretary warned that national security is "tied inextricably to our alliances," following Trump's decision to abandon the Syrian Kurds.
But President Trump says it’s OK for Turkey and the U.S.-allied Kurds to fight. "Let them!" he tweeted.
A U.S. military official said the situation across northeastern Syria was "deteriorating rapidly."
Turkey’s continued push into Syria comes days after President Donald Trump cleared the way for Turkey’s air and ground offensive.
"Turkey, Europe, Syria, Iran, Iraq, Russia and the Kurds will now have to ... figure the situation out," the president tweeted.
One word -- solidarity -- links Brace Belden's disparate activities.
The figure is hundreds more than the number the U.S.-led coalition claims over the entire four-year campaign against IS, the groups said.
Human rights lawyer Amal Clooney is urging the United Nations to fight for sexual violence survivors.
The senator reportedly called the president's pullout plan the "dumbest f**king idea" he'd ever heard. Now he's giving Trump props for a small backpedal.