HIllary's Nondisclosure

Mr. Obama has released all of his tax returns. So why has Hillary refused to release her tax returns for examination by the voters. Where did the alleged five million dollar donation by Hillary to her campaign come from? As voters don’t we deserve to know the genesis of this five million dollars? At a time when Bill Clinton has been masquerading around the globe, freelancing, making all sorts of deals with blatantly corrupt dictatorial regimes who are allegedly donating to his presidential library and foundation, it seems to me to be a very relevant question as to the five million dollars Hillary donated to her own campaign. What do the Clintons have to hide in not disclosing information regarding their taxes and finances?