A further 76% of the respondents said they are concerned that Trump's indictment is politically motivated, compared to just 12% who said they are worried that the ex-president's alleged conduct is a national security risk. Another 12% said both matters concerned them, the survey showed.
A total of 61% of those sampled ruled out any changes to their views about Trump in light of the charges announced in the indictment, while 14% said their opinions might change for the better, according to the findings.
Most Republican voters (74%) would like to see a candidate similar to Trump if he were not the nominee.
The poll was conducted from June 7-10 among a sample of 2,480 US adult residents with a margin of error not exceeding 5.5 points.
On Friday, an indictment was unsealed charging Trump and a personal aide with 38 total criminal counts, including for willful retention of national defense information and making false statements. Trump is set to appear at a federal courthouse in Miami on Tuesday for proceedings.