“Trump didn't invite them.”
Oh yes he did. The following two paragraphs are excerpted from the link given further below:
“Turkey will soon be moving forward with its long-planned operation into Northern Syria,’” the White House said in a statement. “The United States Armed Forces will not support or be involved in the operation, and United States forces, having defeated the ISIS territorial ‘Caliphate,’ will no longer be in the immediate area.”
“President Donald Trump, who apparently made the decision after a phone call with Turkish president Recep Tayyip Erdogan on Sunday.”
Trump-Syria policy: the decision and confusing aftermath, explained - Vox
Definition of invitation:
NOUN
1. a written or verbal request inviting someone to go somewhere or to do something.
• the action of inviting someone to go somewhere or to do something.
•
a situation or action that tempts someone to do something or makes a particular outcome likely.
Evidence of fact. Donald Trump invited Erdogan into Syria, period.