02/08/2015 05:37 pm ET Updated Feb 08, 2015

Brian Williams Cancels Appearance On 'Late Show With David Letterman'

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NBC's Brian Williams cancelled a planned Thursday night appearance on CBS's 'Late Show with David Letterman,' POLITICO's Mike Allen and CNN's Brian Stelter reported on Sunday.

The cancellation comes after Williams admitted this week that he was never aboard a helicopter that was struck by rocket-propelled grenade fire and forced down in Iraq in 2003, as he had previously claimed.

After recanting his story, Williams announced on Saturday that he would be taking a temporary leave from NBC Nightly News. In addition, NBC is investigating his reporting of his 2003 trip to Iraq as well as 2005's Hurricane Katrina. News outlets are also questioning a story Williams told about being mugged at gunpoint back in the 1970s.

In the midst of these revelations, there is even speculation as to who could potentially replace Williams at NBC should the network decide to part ways with the embattled anchor.