According to the poll of 500 likely Republican primary voters, which was conducted Aug. 11-12 by Trump pollster Tony Fabrizio, only 24 percent “strongly approved” of Kemp, a fraction of the 74 percent figure Trump registered among the same group. It found that 27 percent disapproved of Kemp, compared to just 5 percent for Trump. Overall, 93 percent approved of Trump, compared to 69 percent for Kemp.

In a hypothetical primary matchup, Kemp would lead Perdue and a number of other challengers — but he’d be shy of the majority of the vote needed to avoid a runoff with Perdue. But the poll also tested a prospective scenario in which Trump endorsed Perdue in a primary against Kemp and found the former senator would flip the script, pulling ahead of the governor, 41 percent to 26 percent, giving Perdue the upper hand going into a runoff against the incumbent.

“We found that Brian Kemp is a weak incumbent that could be very susceptible to a strong primary challenge,” Fabrizio and two of his partners, David Lee and Travis Tunis, write in a memo outlining the results of the survey, adding, “Trump’s endorsement of David Perdue would completely upend the race.”