The debate will be hosted by ABC affiliate WFAA, the station reported Wednesday. The debate will be in a "roundtable format" similar to a July GOP debate hosted by WFAA that featured Cruz and Lt. Gov. David Dewhurst. The format will allow moderators to ask follow-up questions and allow the candidates to address each other.
Cruz, a former Texas solicitor general, defeated Dewhurst in the July 31 Republican primary runoff. Sadler, a former state representative, beat retired educator Grady Yarbrough in the Democratic runoff.
Additional debates between the candidates may be scheduled before the Nov. 6 election, according to the campaigns.