"The president and some aides have had simmering frustrations with Parscale for a while"

Trump has long distrusted negative poll numbers — telling aides for years that his gut was right about the 2016 race, when he insisted that he was ahead in the Midwest and Florida. At the same time, Parscale and other Trump aides are talking up the sophistication of their data and voter outreach capabilities this time.

The president and some aides have had simmering frustrations with Parscale for a while, believing the campaign manager — a close Kushner ally — has enriched himself from his association with Trump and sought personal publicity. Trump had previously been angered when Parscale was the subject of magazine profiles. This latest episode flared before the campaign manager was featured in a New York Times Magazine profile this week.

Aides have grown particularly worried about Michigan — which some advisers have all but written off — as well as Florida, Wisconsin and Arizona.