Republican Indiana Senate candidate Richard Mourdock is renewing his call for a full investigation into the terrorist attackon the U.S. consulate in Libya, after suggesting that the Obama administration is engaged in a cover-up. The Obama administration is still investigating the September attack in Benghazi, which resulted in the death of a U.S. Ambassador Chris Stevens and three other foreign service members. A suspect has been detained and is being questioned in Tunisia, but Secretary of State Hillary Clinton has asked for patience as a board review continues to unfold. Republican leaders and candidates have pounced on the issue, however, and questioned whether the president could have provided more help ahead of the attack. Other critics point to a series of e-mails suggesting the White House was made aware of the details of the attacks that linked the assault to terror groups instead of a controversial YouTube video. In a telephone interview with WFPL a week before Election Day, Mourdock suggests that the Democratic-controlled Senate is sitting on the investigation until after the election, and alleges the White House is intentionally looking the other way. "This is a matter of the vital security interest of the United States. We’ve had four Americans, including a United States ambassador assassinated," Mourdock said. "But still we don’t know what the story is because obviously the White House is sitting on a cover-up." Mourdock said the new information about the attack is troubling, and he is disappointed in the silence of Rep. Joe Donnelly, his Democratic opponent for the senate seat. "This is a great time for Joe Donnelly to show some bipartisanship and join me as a Republican to call for his party that runs the U.S. Senate to have these hearings and have the investigation. And if Congressman Donnelly wont’ buck his party leadership before an election he’ll certainly never do it afterwards," Mourdock said. Mourdock is calling for an immediate probe by the Senate Foreign Affairs Committee to delve into requests made by the consulate for additional security. The House Oversight Committee led by Rep. Darrell Issa, R-Ca., has already launched a probe into the attack, seeking more information from the Obama administration to explain its security decisions. Last week, sources told Fox News that a request for military back-up was "denied by the CIA chain of command", but the agency has said that report is false. President Obama has rebuffed suggestions of deliberately hiding information from the public, and said in a recent interview that he takes offense to any suggestion that his administration is trying to do so. Some political observers have suggested the GOP is trying to ratchet up the controversy in the days ahead of a close presidential race. From The National Journal: