While President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE retains the support of the vast majority of people who voted for him in 2016, 10 percent said they would not commit to voting for him again, according to a new American Barometer survey.

The poll, conducted for Hill.TV by the HarrisX polling company, found that 89 percent of registered voters who backed Trump in 2016 would do so again in a hypothetical re-match with former Democratic candidate Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE. Four percent of former Trump voters said they would switch to Clinton.

"You may find that those same people who voted for Trump, like him a little bit less, or find themselves more frustrated, but they're not going to all of the sudden become Clinton voters," Murphy, a partner at ALG Research, told Hill.TV's Concha on Friday's episode of "What America's Thinking."

Clinton retained the support of 94 percent of respondents who said they had voted for her previously. In the sample, 2 percent said they would switch their votes to Trump.

Neither candidate attracted much support among the 10 percent of respondents who said they did not vote in 2016. Clinton fared slightly better among this group with 17 percent saying they would back her in a rematch, while 10 percent said they would vote for Trump. The majority, 53 percent, said they would not vote.

Four percent of respondents declined to state a preference.

The poll comes as Republicans are doubling down their efforts to defend GOP control of the House and Senate against Democrats ahead of November's midterm elections. The elections are being viewed as what will likely be a referendum on Trump's first years in office.

Trump has hit the campaign trail for various Republican candidates, in hopes of galvanizing the GOP base.

While the president remains relatively popular with his political base, his approval ratings continue to hover between 40 and 50 percent, while his disapproval ratings have come in over 50 percent.

Trump on Friday had an average approval rating of 42 percent and an average disapproval rating of 53 percent, according to the Real Clear Politics Poll Average.

The American Barometer was conducted on September 14-15 among 1,000 registered voters. The sampling margin of error is 3.1 percentage points.

— Julia Manchester