Washington (CNN) President Donald Trump tweeted Tuesday that "American troops" have "terminated" ISIS leader Abu Bakr al-Baghdadi's "likely" replacement.

"Just confirmed that Abu Bakr al-Baghdadi's number one replacement has been terminated by American troops. Most likely would have taken the top spot - Now he is also Dead!" Trump tweeted.

A US official told CNN that "the President was referring to ISIS spokesperson Abu Hasan al-Muhajir."

A senior State Department official told reporters Monday that al-Muhajir was killed by US forces in Aleppo province near Jarablus. "He was killed very close to the northeast, very close to the Euphrates River, near Jarablus," the official said. "He was killed by US forces."

The official described al-Muhajir as both a spokesperson and "kind of a number two" to Baghdadi.

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