Washington ( CNN ) -- NBC has apologized to Rep. Michele Bachmann after the house band for `` Late Night with Jimmy Fallon '' played an inappropriate song during her appearance on the show Monday , CNN confirmed Thursday . Bachmann received a letter Wednesday from Doug Vaughan , NBC 's senior vice president for special programs and late night , that apologized for what happened and called the incident `` not only unfortunate but also unacceptable , '' said Alice Stewart , the Republican presidential hopeful 's spokeswoman . According to Stewart , the letter also said the show 's band , which played the song `` Lyin ' Ass Bitch '' by Fishbone as Bachmann first appeared on stage , was `` severely reprimanded . '' `` She accepted the apology , '' Stewart told CNN Thursday . Bachmann also spoke to Fallon Wednesday and had a `` nice conversation , '' said Stewart , who described the late night host as `` remorseful '' and `` a class act . '' Fallon had offered an apology via Twitter on Tuesday , but Bachmann then called for an official apology from NBC . The controversy started Monday when the Minnesota congresswoman walked out to greet Fallon on stage , and the show 's band , The Roots , played the Fishbone song . Bachmann admitted being oblivious to the slight , telling Fox News on Wednesday that she `` was n't aware of it at all . '' She insisted the treatment she received through the song amounted to `` sexism , '' and she added that it `` would n't be tolerated if it was Michelle Obama and should n't be tolerated for a conservative woman , either . '' Still , she said , `` I 'd love to go back again . '' Some of Bachmann 's ire was directed toward the drummer of Fallon 's house band , Ahmir `` Questlove '' Thompson . `` If that song had been played for Michelle Obama I have no doubt that NBC would 've apologized to her and likely they could 've fired the drummer or at least suspended him . None of that happened from NBC and this is clearly a form of the bias on the part of the Hollywood entertainment elite , '' Bachmann said . The song choice appeared to be intentional . Prior to Bachmann 's arrival on stage , the band 's drummer , Questlove , tweeted during the show : `` Aight late night walkon song devotees : you love it when we snark : this next one takes the cake . ask around cause i aint tweeting title . '' Despite the song choice , the interview was amicable , with Bachmann and Fallon trading jokes . On Tuesday , Fallon tweeted : `` I 'm honored that @ michelebachmann was on our show yesterday and I 'm so sorry about the intro mess . I really hope she comes back . '' The band also issued a statement saying `` the performance was a tongue-in-cheek and spur-of-the-moment decision . '' Stewart said Thursday that Bachmann recognized that Fallon `` had no idea this happened . '' Fallon has invited Bachmann back on the show , Stewart said , adding that no date was set but `` she would prefer to pick her opening music next time . '' CNN 's Tom Cohen contributed to this report .
NEW : The Bachmann apology letter called the incident `` unacceptable '' The candidate called for the network to apologize over the incident on Tom Cohen show . A song with a derogatory title was played as NBC walked on stage Tuesday . Fallon apologized by Twitter on Monday .