Donald Trump is asking when the United States and other countries will "fight back" against the perpetrators of attacks like Monday's deadly truck rampage in a Christmas market in Berlin.
Trump is quoting a video released Friday by the Islamic State group that shows Berlin attack suspect Anis Amri swearing allegiance to the group's leader while vowing to fight non-Muslims.
Trump, writing on Twitter Friday, quotes Amri saying, "By God's will we will slaughter you pigs."
The president-elect adds: "This is a purely religious threat, which turned into reality. Such hatred!"
Amri was killed Friday morning by police in Milan.