Mr Parscale, whom Mr Trump said would shift to a role focused on digital strategy, was blamed internally for the botched Tulsa, Oklahoma, rally last month that drew a much smaller-than-expected crowd.
Another poll by NBC News-Wall Street Journal showed Biden ahead of Trump by 11 points among registered voters, while a Reuters/Ipsos poll showed Biden leading by 10 points. It found only 36 percent of Americans think the president is doing a good job, his lowest score in two years, and 44 percent approve of his handling of the economy, a three-year low.
The move comes as poll after poll shows Trump trailing Joe Biden, by an average of 8.6 percentage points according to the Real Clear Politics average.
F1 Styrian GP: "Desperate" Stroll move should be penalised, says Ricciardo
The rules dictate that teams must design specific parts of the auto themselves. Racing Point are now fourth with 22 points while Renault are sixth on eight.
In his statement, Trump credited both Parscale and Stepien for their involvement in his 2016 victory in the United States presidential election and predicted that he would glide to a second term in office. Over 137,000 Americans have now died from the disease and more than 3.4 million have been infected.
This could mean more aggressive attacks against Mr Biden or his running mate, and more co-ordination with the Republican National Committee.
Trump is losing badly to Biden in most of the national polls. Democrats are paring back their in-person event significantly. News of the shuffle was delivered to Parscale on Wednesday afternoon by White House adviser and Trump son-in-law Jared Kushner. He memorably referred to the Trump campaign at the Death Star.
Another piece of reporting from the Axios story: Trump still brings up a Tucker Carlson segment from June in which the Fox News host said he "could well lose" in November if he doesn't right the ship. But they said Trump shared the blame because he lacked discipline on how to communicate what he would do with another four-year term in the White House. "Don't ask him, he doesn't have an answer".