GEORGETOWN — U.S. Sen. Ted Cruz and his Democratic rival Beto O’Rourke still have no agreement to debate, putting at risk the anticipated first showdown between the two men in Dallas next week.

“At this point I don’t know,” Cruz said on Friday night during a campaign stop in Georgetown, when he was asked whether the debate will go on as scheduled Aug. 31.

Cruz’s campaign dictated a set of rigid terms to O’Rourke, insisting he agree to their plan to hold five debates without any negotiation over the details. O’Rourke agreed in principle to debate, but he objected to El Paso — his hometown — being left out of the debate plans and the fact that all of the debates would be on Friday nights.

In a letter to O’Rourke, Jeff Roe, Cruz’s campaign manager, said the senator would be willing to move one of the debates to El Paso but that none of the other dates and locations or the format are up for negotiations. The five cities listed by Cruz are Dallas, McAllen, San Antonio, Houston and Lubbock.

O’Rourke’s campaign said they’ve left messages seeking to hammer out details, and it was Cruz’s campaign that has refused to come to the table to work it all out.

Proposed debates Debate 1: Aug. 31 in Dallas Debate 2: Sept. 14 in McAllen Debate 3: Sept. 21 in San Antonio Debate 4: Oct. 5 in Houston Debate 5: Oct. 12 in Lubbock

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But Cruz said Friday they are waiting on O’Rourke to agree to their proposed five debates.

jeremy.wallace@chron.com | twitter.com/JeremySWallace