Washington (CNN) Democrats on Monday pre-empted the upcoming release of a Republican-led House Select Committee report on Benghazi by issuing their own version of a probe into the 2012 terror attack that killed four Americans on Hillary Clinton's watch as secretary of state.

The move by Democrats on the panel was designed to debunk the conclusions of the committee's majority report that is expected to be highly critical of Clinton.

"We have been hampered in our work by the ongoing Republican obsession with conspiracy theories that have no basis in reality," said the Democratic report, which underscored the fierce political divisions between Republicans and Democrats over the attack on a U.S. consular post and a CIA annex in the Libyan port city. "Rather than reject these conspiracy theories in the absence of evidence -- or in the face of hard facts -- Select Committee Republicans embraced them and turned them into a political crusade."

"We hope our report will put to rest the conspiracy theories about Benghazi once and for all and return the focus to where it belongs—on the goal of improving the security of Americans serving abroad," the report continued.

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