( CNN ) -- St. Louis County Prosecutor Robert McCulloch juggled two roles on Wednesday : overseeing the presentation of evidence in the Michael Brown case to a grand jury and responding to the flurry of attacks and calls for his recusal from the case . McCulloch went on the offensive after Missouri Gov . Jay Nixon tried to deflect calls for the prosecutor 's ouster by saying it was up to McCulloch to recuse himself . McCulloch 's deep ties with local police and perceived favoritism of law enforcement in criminal cases have led to concerns about his ability to be impartial in the Brown case . Should he recuse ? In a statement sent to the media on Tuesday night , Nixon said , `` From the outset , I have been clear about the need to have a vigorous prosecution of this case , and that includes minimizing any potential legal uncertainty . '' `` I am not asking St. Louis County Prosecutor Bob McCulloch to recuse himself from this case . There is a well-established process by which a prosecutor can recuse themselves from a pending investigation , and a special prosecutor be appointed . Departing from this established process could unnecessarily inject legal uncertainty into this matter and potentially jeopardize the prosecution , '' Nixon said . McCulloch 's response : Nixon needs to `` man up . '' `` It 's the typical Nixon doublespeak , '' McCulloch said during a radio interview with The McGraw Show on KTRS . `` He says nothing and he 's ducking . '' McCulloch said the state of emergency Nixon declared on Saturday gave the governor authority to remove McCulloch from the case . McCulloch said Nixon should `` just make a decision . '' `` He does n't need a reason , '' McCulloch said to KTRS , `` all he has to do is a simple yes he 's out , or no he 's not out , and let 's move on . The Brown family deserves that and the rest of the community deserves it . '' McCulloch firmly stated he is not removing himself from the case . `` I have absolutely no intention of walking away from the duties and responsibilities entrusted to me by the people of this community . I 've done it for 24 years , '' he said . The clock is ticking for a decision , according to McCulloch . Now that the presentation has begun , recusing the main prosecutor could complicate matters even more . `` The most devastating thing that could happen , is if a week from now , a month from now he ( Nixon ) decides that he 's taking me off this case and everybody is starting over . Stand up , man up , '' said McCulloch , `` This family deserves nothing less than that . '' 5 things to know about Michael Brown 's shooting . Grand jury presentation . Wednesday marked the first day of evidence presentation to the grand jury , a process that will likely continue into the fall . `` We will be presenting absolutely everything to this grand jury , '' McCulloch said on KTRS . `` Every statement that a witness made , every witness , every photograph , every piece of physical evidence . Absolutely nothing will be left out , so the grand jury is making their decision based upon absolutely everything and we 'll go from there . '' But not all the evidence is ready to be presented , according to McCulloch , which is why prosecutors will have to present in parts . `` As things are completed they 'll be presented to the grand jury , '' said McCulloch during an interview with CNN affiliate KMOV . `` But we want to get the process started , and not wait until absolutely everything is done before we even start it . '' Overwhelming Volume of Evidence . The evidence in the shooting death of Michael Brown involves investigations from multiple agencies , including the Ferguson Police Department , St. Louis Police Department , FBI , U.S. Attorney 's Office and the Department of Justice . Asked how many witnesses have been interviewed so far , McCulloch told KMOV , `` I do n't know . Dozens and dozens , maybe hundreds . '' He said the FBI has been successful at locating witnesses in the Canfield apartments , near where Brown was killed . `` The federal government is doing their independent investigation , and so they 're also talking to witnesses , and ultimately that will be made available to us , '' McCulloch told KMOV . `` They 're doing their own forensic testing . They 've done their own or will do their own post-mortem examination , and those results will be provided , all to the grand jury . '' Grand jury time line . McCulloch estimated prosecutors will finish presenting the case by mid-October , a time line that brings its own set of challenges with the grand jury calendar , because the current session ends in early September . `` We will be presenting what we can , between now and the end of their term , which is early September , '' McCulloch told KTRS , `` after that , their term is extended just for this case and that 's all they will be doing . They can meet for as long as they want , as long as they want to meet . '' `` We present the full case to the grand jury and should there be an indictment , the full case will be presented to the trial jury so that they make the decision , '' McCulloch said . `` I do n't decide if somebody is guilty or not guilty . I present the evidence to a jury and the jury makes that decision . '' Magazine : The Aftermath in Ferguson . Read more about the flash point in the Heartland at CNN.com/US .
Michael Brown , prosecutor and Missouri governor . The chorus calls for prosecutor 's chair amid controversy . Wednesday was the first day of grand jury evidence presentation .