Two House Republicans say they have been informed by whistleblowers that the U.S. Consulate in Benghazi was attacked and threatened 13 times before the incident last month that killed four Americans.

Reps. Darrell Issa (R-Calif.) and Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (R-Utah) sent Secretary of State Hillary Clinton Hillary Diane Rodham ClintonHillary Clinton after debate: 'Everyone better vote' Hillary Clinton: 'Black Lives Matter' is 'very profoundly a theological statement' House in near-unanimous vote affirms peaceful transfer of power MORE a letter on Tuesday that detailed the whistleblowers’ allegations.

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“Based on information provided to the Committee by individuals with direct knowledge of events in Libya, the attack that claimed the ambassador’s life was the latest in a long line of attacks on Western diplomats and officials in Libya in the months leading up to September 11, 2012,” Issa and Chaffetz wrote. “It was clearly never, as Administration officials once insisted, the result of a popular protest."

The congressmen said the consulate asked for more security to deal with the growing threat but was turned down by the administration.

“In addition, multiple U.S. federal government officials have confirmed to the Committee that, prior to the September 11 attack, the U.S. mission in Libya made repeated requests for increased security in Benghazi. The mission in Libya, however, was denied these resources by officials in Washington.”

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The two lawmakers told Clinton they intend to convene a hearing of Issa’s House Oversight panel on Oct. 10 to review possible security failures in Libya, including “State Department security assessments and security related decision making.”

Clinton will “cooperate fully” with the Republican probe, the State Department said.

“The secretary intends to respond to the congressmen today,” State Department spokeswoman Victoria Nuland said at her daily briefing Tuesday.

“And her letter will make absolutely clear the desire of this department, her personal desire to cooperate closely with the committee and with all members of Congress, both in their document requests, in their requests for witnesses for their hearing, because we share the same goal: We want to get to the bottom of precisely what happened and learn any lessons that we need to learn from it. We're taking this very, very seriously.”

The letter from the GOP congressmen for the first time reveals an April 6 attack against the consulate in which two former security guards threw homemade improvised explosives over the fence of the compound.

The letter also says militants made no secret of their intention to target Americans in Libya.

On May 22, a warning message was posted on Facebook that a rocket-propelled grenade attack against the Red Cross offices in Benghazi would be followed by a “message for the Americans disturbing the skies over Derna.” A separate threat was made the following month against Ambassador Christopher Stevens that mentioned his morning run with a security detail, complete with a photo of the late ambassador.

Stevens and three other Americans were killed in a Sept. 11 attack on the consulate. The Obama administration initially blamed the attack on militants who acted spontaneously and used protests against an anti-Islam video posted online as cover.

But the administration has shifted its account, with Director of National Intelligence James Clapper calling it a “deliberate and organized terrorist attack” on Friday.

Republicans say the administration’s account has been misleading. Sen. John McCain John Sidney McCainAmerica's presence in Cam Ranh Bay should be more than occasional Meghan McCain, husband welcome first baby girl, Liberty Sage McCain Domenech The Hill's Morning Report - Sponsored by JobsOhio - Showdown: Trump-Biden debate likely to be nasty MORE (R-Ariz.) and other GOP lawmakers believe the attack was premeditated and argue the administration has played down that possibility because it could hurt President Obama’s reelection effort.

— This story was first posted at 9:48 a.m. and has been updated.