A new poll finds Hillary ClintonHillary Diane Rodham ClintonTrump touts report Warner attempted to talk to dossier author Poll: Nearly half of Iowans wouldn’t vote for Trump in 2020 Rubio on Warner contact with Russian lobbyist: It’s ‘had zero impact on our work’ MORE more trusted than congressional Republicans over the Benghazi, Libya, controversy, as GOP lawmakers continue to probe the deadly attack on the U.S. Consulate.

Democratic firm Public Policy Polling found that 49 percent of respondents trust former Secretary of State Clinton, while 39 percent trust congressional Republicans more on the issue.

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The survey was conducted from May 10-12, at the end of a week during which congressional Republicans held hearings and hammered the administration’s response to the terrorist attack, which left four Americans dead.

Sen. Lindsey GrahamLindsey Olin GrahamMcConnell: 'Whoever gets to 60 wins' on immigration Overnight Tech: Uber exec says 'no justification' for covering up hack | Apple considers battery rebates | Regulators talk bitcoin | SpaceX launches world's most powerful rocket Overnight Cybersecurity: Tillerson proposes new cyber bureau at State | Senate bill would clarify cross-border data rules | Uber exec says 'no justification' for covering up breach MORE (R-S.C.) this week suggested Clinton be subpoenaed to testify on the attack, and Rep. Darrell Issa (R-Calif.), chairman of the House Oversight Committee, said that responsibility for the attacks lies, if not with Clinton, than with "somebody close" to her.

Many Republicans see the Benghazi attack as a possible early line of offense with which to hammer Clinton ahead of her possible run for president in 2016. And two of her potential Republican opponents — Sens. Marco RubioMarco Antonio RubioTrump must send Russia powerful message through tougher actions McCain, Coons immigration bill sparks Trump backlash Taking a strong stance to protect election integrity MORE (R-Fla.) and Rand PaulRandal (Rand) Howard PaulPentagon: War in Afghanistan will cost billion in 2018 Overnight Finance: Senators near two-year budget deal | Trump would 'love to see a shutdown' over immigration | Dow closes nearly 600 points higher after volatile day | Trade deficit at highest level since 2008 | Pawlenty leaving Wall Street group Rand Paul calls for punishment if Congress can't reach a long-term budget deal MORE (R-Ky.) — penned op-eds criticizing the administration's response last week.

Paul was particularly forceful in his op-ed, writing that: "The new evidence we have today — and that continues to mount — suggests that at the very least, Mrs. Clinton should never hold high office again."

But the new poll indicates the issue is not yet catching on with voters. A majority, by a 56-38 split said passing immigration reform was more important than investigating Benghazi. And a majority said passing a bill that requires background checks for gun purchases should be a priority over Benghazi by 52-43 percent.

Sixty-five percent of respondents said they didn't think Benghazi was the biggest political scandal in American history.

And despite GOP attacks, more than half of respondents still view Clinton favorably, by 52-44 percent. More than half of respondents, though, view congressional Republicans unfavorably, at 36-57.

The survey was conducted among 576 voters nationwide and has a 4-point margin of error.