Speaking at a breakfast with reporters hosted by The Christian Science Monitor, Wasserman Schultz said the debate schedule was final and there would be no changes.

"We're not changing the process. We're having six debates," said Wasserman Schultz, who has been under fire from several Democratic presidential candidates over the debates. "The candidates will be uninvited from subsequent debates if they accept an invitation to anything outside of the six sanctioned debates." 

In recent weeks, pressure has been building on the DNC to grow the debate schedule. The national party has sanctioned six debates, a dramatic cutback from 2008, when there were about two-dozen.