/*Fumo*/ is appealing his 137-count conviction on fraud and tax charges. Federal prosecutors are seeking to appeal Fumo's 55-month sentence, a fraction of the 15-year term they sought.
Fumo's lawyers say he had planned to report to prison, but now needs time to fight the government appeal.
Fumo says there are also medical reasons, filed under seal, to justify the delay.
A jury convicted the powerful Fumo this year of defrauding the state senate, a South Philadelphia nonprofit and a seaport museum of millions of dollars.