More than half of Americans, including almost a third of Republicans, would back the impeachment of 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 were he to issue a pardon for himself related to the ongoing Russia investigation.

A USA Today/Suffolk University poll released Tuesday found that 64 percent of Americans say the president does not have the power to pardon himself, compared to just 18 percent who say he does. Republicans are against Trump on this as well, with 45 percent saying he does not have the power to self-pardon and 29 percent saying he does.

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If the president were to take the step to pardon himself for a criminal charge related to Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's special counsel investigation into Russia's election interference, 58 percent of Americans would support Trump's impeachment, the poll says.

That number includes 31 percent of Republicans, according to the poll. Just 17 percent of Republicans indicated in the poll that they would feel "support" for Trump if he pardoned himself.

"GOP voters are still as supportive of Trump as they have ever been, but a sizable portion don't see him as above the law of the land,” said David Paleologos, Suffolk University's poll director. “This finding signals the introduction of a possible wedge issue within the Republican party, the likes of which we haven't seen in this presidency."

Just 30 percent of Americans approve of how Trump has handled the issue of presidential pardons so far, according to the poll, lower than his basic approval rating in the poll, which sits at 43 percent.

The USA Today/Suffolk University poll was conducted between June 13-17, and contacted 1,000 registered voters. It carries a margin of error of 3 percentage points.