Miller, a deputy White House chief of staff during the Trump administration, had called Alex Pretti, a Minneapolis nurse killed by federal agents, a 'would-be assassin'.
He also claimed Pretti 'tried to murder federal law enforcement' without offering any evidence to support these assertions.
When pressed on Miller's potential apology, the White House press secretary stated the incident remains under investigation.
The press secretary added that no one at the White House wishes to see Americans hurt or killed.