To a large degree, Trump surely bears responsibility - his juvenile outbursts on Twitter, aggressive pandering to white nationalism, and hard-right social policy do little to attract mainstream voters to the Republican Party.
What does the poll show?Approximately one in three Republicans (31 percent) say they would prefer the 2020 Republican nominee be someone other than Trump.
But more than 84 percent of Republicans approve of the president's performance, and nearly a third of white evangelical Protestants say there is almost nothing Trump could do to lose their support.
Among Republican respondents, 40 percent consider themselves to be "Always Trump", and supported him in the 2016 GOP primary and would support him in 2020. Eighty-four percent of Republicans, including more than nine in ten "strong" Republicans (91 percent), approve of the job Trump is doing as president.
What else did the poll find?He stated in November that if he were in Alabama, he would "run to the polling place" to vote for a Democrat over Moore.
"What struck me is that Trump supposedly got 81 percent of the white evangelical vote and he now has 72 percent approval, which means that white evangelicals are still tracking roughly what they voted", Henry Olsen, a senior fellow at the Ethics and Public Policy Center, said after participating in a panel discussion about the newly released survey.
"When Abraham walks with God - to get all biblical here - and asks, 'What if there are just 15 or 10 good men left in the city?' The question for the Republican Party now, since they like to speak in these biblical terms, are there 10 good men left in the Republican Party?" But Trump retains significant support among rank-and-file Republicans and white evangelical Protestants.