WASHINGTON -- As Republicans are increasingly calling the Obama administration's response to the Benghazi attacks a cover-up worse than Watergate and even floating impeachment, Sen. John McCain (R-Ariz.) urged a note of caution on Sunday, saying he wasn't yet willing to go that far.

"With all due respect, I think this is a serious issue," said McCain on ABC's "This Week." "I will even give the president the benefit of the doubt on some of these things. We need a select committee."

On Thursday, Senate Armed Services Committee Ranking Member James Inhofe (R-Okla.) accused President Barack Obama of overseeing "the most egregious cover-up in American history." He added that "people may be starting to use the 'I word'" before long.

Former Arksansas Gov. Mike Huckabee (R) also said on his radio show this week, "I believe that before it’s all over, this president will not fill out his full term. As bad as Watergate was because it broke the trust between the president and the people, no one died. This is more serious because four Americans did in fact die. And President Obama has yet to explain why did they die.”

McCain also defended Obama against impeachment during a late February town hall, saying, "I do not believe that the president has committed impeachable offenses -- that's high crimes."

Still, the senator did tell ABC's Martha Raddatz on Sunday that he does believe the Obama administration's response to the terrorist attacks in Benghazi on Sept. 11, 2012, constituted a "cover-up" because "there was willful removal of information, which was obvious."

Sen. Susan Collins (R-Maine) was similarly reluctant to back impeachment talk during an interview on CNN's "State of the Union" on Sunday.

"I don't at this point, I will say," she said when asked if she supported it. "But that doesn't mean that these allegations aren't serious."

The Benghazi issue was reignited last week after House Republicans held a hearing on the attacks and ABC News published a story showing that administration talking points offered immediately after the attacks went through several rounds of editing by officials, including in the State Department.

While many Republicans have charged political interference, others -- including longtime State Department reporter Glenn Kessler at the Washington Post -- have noted that it seems more like a case of bureaucratic in-fighting.

Sens. Lindsey Graham (R-S.C.) and Rand Paul (R-Ky.) have used the Benghazi affair to argue that former Secretary of State Hillary Clinton is now unfit to be president -- should she ever decide to run. McCain, however, was less willing to come to the same conclusion on Sunday.

"She had to have been in the loop some way, but we don’t know for sure," he said, adding that he would like to see Clinton back on Capitol Hill to testify again.

"We need a select committee that interviews everybody," he said. "I don’t know what level of scandal, unquote, this rises to, but I know it rises to the level where it requires a full and complete ventilation of these facts."

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  • Obama Is Not An American Citizen

    One of the most popular Obama conspiracy theories (aka the Birther Movement), endorsed (or not denied) by the likes of <a href="http://www.huffingtonpost.com/_263532.html">Tom Delay</a>, <a href=http://www.huffingtonpost.com/_251393.html>Lou Dobbs</a>, <a href="http://www.huffingtonpost.com/_250891.html">Chuck Norris</a> and <a href="http://www.huffingtonpost.com/_242555.html">Liz Cheney</a>, it claims that Obama is not an American citizen, thus rendering his presidency illegitimate, or something. The theory hinges on the false claim that his birth certificate is fake. Birther queen Orly Taitz (a lawyer and dentist from California) continues to lead the march, despite her lawsuit getting <a href="http://www.huffingtonpost.com/2009/10/29/orly-taitz-lawsuit-thrown_n_338870.html">thrown out</a> and a <a href="http://www.huffingtonpost.com/2009/10/13/orly-taitz-slapped-with-2_n_318546.html">$20,000 fine</a>.

  • Obama Wants "Re-Education Camps For Young People

    Rep. Michele Bachmann (R-Minn.), a proponent of many bizarre and outlandish critiques of President Obama, declared in April that the White House was trying to install <a href="http://www.huffingtonpost.com/2009/04/06/bachmann-obama-wants-re-e_n_183552.html">youth re-education camps</a>. "It's under the guise of -- quote -- volunteerism. But it's not volunteers at all. It's paying people to do work on behalf of government," said the Minnesota Republican. "I believe that there is a very strong chance that we will see that young people will be put into mandatory service. And the real concerns is that there are provisions for what I would call re-education camps for young people, where young people have to go and get trained in a philosophy that the government puts forward and then they have to go to work in some of these politically correct forums."

  • Larry Sinclair's Rabbit Hole Of Insanity

    This one is a doozy. Larry Sinclair, <a href="http://www.politico.com/news/stories/0608/11164.html">a petty criminal specializing in forgery</a>, spread wild accusations via YouTube involving <a href="http://www.huffingtonpost.com/2008/06/18/obama-accuser-larry-sincl_n_107900.html">gay sex, drugs and possible murder committed by Barack Obama</a>. At one point reporters apparently took Sinclair seriously enough to attend a press conference he gave, most remarkable for his lawyer's appearance in a kilt, which he explained was intended to secure comfort for his unusually large sexual organs: "Those at the other end of the spectrum find [pants] quite confining."

  • The Case Of The Fake Thesis

    In which a group of right-wingers get taken in by a satiric blog post on Barack Obama's college thesis, written ages ago, and frantically presented as real. The post, which was tagged as SATIRE, described how <em>Time</em> Magazine's Joe Klein had obtained ten pages of a thesis written by Barack Obama, in which he wrote about how the Constitution was "inherently flawed." Then Rush Limbaugh and Michael Ledeen presented this story as <a href="http://www.huffingtonpost.com/2009/10/23/fake-obama-thesis-story-g_n_332255.html">fact</a>.

  • Bill Ayers Wrote 'Dreams From My Father"

    A popular theory on right-wing websites like <a href="http://www.freerepublic.com/focus/news/2101151/posts">The Free Republic</a>, <a href="http://www.americanthinker.com/2008/10/who_wrote_dreams_from_my_fathe_1.html">American Thinker</a> and <a href="http://www.wnd.com/?pageId=110784">WorldNetDaily</a>, claiming that educator (and former radical) Bill Ayers helped Obama write "Dreams Of My Father." There is <a href="http://www.obamaconspiracy.org/category/books/">no evidence</a> supporting this claim.

  • Obama As Antichrist

    Is Obama the Antichrist? <a href="http://www.youtube.com/watch?v=HDB5BFoSQLs&feature=player_embedded">These</a> <a href="http://www.snopes.com/politics/obama/antichrist.asp">folks</a> think maybe so. McCain also verged on endorsing this theory during the campaign season with an attack ad called "<a href="http://www.time.com/time/politics/article/0,8599,1830590,00.html">The One.</a>"

  • Obama As Muslim

    A theory that began circulating during the campaign season and has been kept alive by Tea Partiers, and other ultra-conservatives. It's taken different forms over the year (<a href="http://www.scribd.com/doc/6516016/Will-Obama-Swearin-on-the-Holy-Koran-or-the-Holy-Bible-After-Attacking-Jesus-Sermon-on-the-Mount">Will Obama be sworn into office on Qur'an??</a>, asks one website.) Most recently Tea Party leader Mark Williams had a meltdown on CNN, and <a href="http://www.huffingtonpost.com/2009/09/15/tea-party-leader-melts-do_n_286933.html">claimed</a> that Obama was an "Indonesian Muslim" and a "welfare thug." According to Obama and those who know him, this is not so.

  • Tells America In His Acceptance Speech To "Serve Satan"

    Ever listened to Led Zeppelin's "Stairway to Heaven" backwards? How about Obama's presidential acceptance speech? This video suggests that the speech, like the Zeppelin song, contains a Satanic message when played in reverse. Go ahead - take a bong hit, try it and tell us what you hear.

  • Hugo Chavez Funded The Obama Campaign

    Did Hugo Chavez fund the Obama campaign? No. But some people thought so after a Fox News affiliate issued a false report claiming that <a href="http://www.snopes.com/politics/obama/chavez.asp">he did</a>.

  • Michelle Banished Barack's Girlfriend To The Caribbean

    One of the few conspiracy theories to go after the Obamas' marriage. The claim is that Michelle banished Barack's female aide (and suspected lover) to the Caribbean. Every person involved, including the woman, says this is <a href="http://www.dailymail.co.uk/news/worldnews/article-1076695/Obama-hit-affair-smears-following-claims-attractive-aide-banned-wife.html">false</a>.

  • Obama Is Malcolm X's Son

    Initiated by the author of the <a href="http://atlasshrugs2000.typepad.com/atlas_shrugs/2008/10/how-could-stanl.html">Atlas Shrugged</a> blog and claiming that Obama is actually Malcolm X's son. As Ezra Klein <a href="http://www.prospect.org/csnc/blogs/ezraklein_archive?month=10&year=2008&base_name=obama_x">pointed out</a> at the time: "Honestly, who wouldn't give Malcolm props for that one?" Klein continued: "And think there's anyway we can fit Tupac into the bloodline? Or maybe Obama actually is Tupac? You know that whole shooting was some bullshit, right? Incidentally, I see no reason to stop with Malcolm. History is full of great Xs for Barack Obama to be related to. Professor X, which would explain why millions of white people lose their minds in his presence. Weapon X, which would explain the adamantium grafted onto his skeleton. XML, which would explain why it's so easy to structure his data. I'm sure there are others."