Trump Foundation Lacks Certification to Operate as Charity: Source

The revelations follows an inquiry by the state attorney general's office.

— -- The Trump Foundation, which is under investigation by the New York Attorney General's office, never obtained the necessary certification to solicit money from the public during its nearly 30-year existence, an investigation by the state's attorney general's office has found, a source briefed on the investigation tells ABC News.

New York State law requires any charity that solicits more than $25,000 a year from the public to obtain a specific kind of certification.

The Trump campaign did not immediately respond to a request for comment and the AG's office declined comment.

In a statement released when the inquiry was announced earlier this month, Trump campaign Jason Miller blasted Schneiderman.

As ABC News previously reported, the foundation's financial forms for 2001 through 2014 are currently available.

The biggest contributor from 2011 to 2014 was Richard Ebers, a man associated with an event-ticketing company, Inside Sports and Entertainment, according to the 990 forms.

Ebers donated more than $1.8 million to the foundation from 2011 to 2014, and he was the largest contributor each of those years.