representative darrell issa , who wrote as chairman of the house committee on oversight and government reform , was ignored until more than a month after clinton had stepped down in february 2013 .
and even then , the reply did not answer the question - instead going into detail over the state department 's email policy .
the leaked letter , obtained by the new york times , casts a further shadow over clinton just days into her bid to become the democrat 's 2016 presidential candidate .
but critics say by using her personal email account , she has since removed the picture from her account .