more onto nature of the charges against brown and reaction from other council members, including marian berry. >> council woman mary cha is the temporary chair woman and she'll be joining us live here in the studio. >> and why dc politics are seemingly overrun with corruption. >> and we have new details and brown's resignation letter. >> reporter: we and histated the resignation letter was coming. he admits to making "serious mistakes in judgement." here is the letter in its entirety. the now former chairman kwame brown wrote dear madam secretary, i hereby resign my position as chairman of the council of district of columbia effectively immediately. i made serious mistakes in judgement for which i take full responsibility. because of the great respect i have for the institution i have chosen the only honourable course in submitting my resignation at this time. i will not hold this body and its important work hostage to my person indiscretions. i have behaved in ways i should not have. i was wrong and i will face the consequences of that conduct. i offer my unconconditional apology to the memb