Anthony Scaramucci is a former White House communications director.
He has frequently defended President Donald Trump.
On Monday, it was clear he no longer supports Trump's reelection bid.
Scaramucci said the top of the 2020 Republican presidential ticket may need to be replaced.
This follows a weekend in which Scaramucci traded barbs with President Trump.
Scaramucci increasingly criticized Trump's rhetoric as well as his recent visits to the scenes of mass shootings.