The presumptive Republican nominee for president has yet to release his tax returns thus far, . Presidential candidates are not required to release tax returns, but the information a candidate’s finances, revealing information such as charitable giving, investments and the tax rate he pays.
The key word here is presumptive Trump may have the delegates, but as yet he hasn’t been crowned the nominee. The information on a person is for the IRS not public consumption to peruse at leisure. It also allows the press to pick apart the nominee’s personal business before he became the nominee.