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Input: After previously withholding his endorsement , U.S. Sen. John Cornyn , R-Texas , said Sunday he 's supporting Ted Cruz for re-election in 2018 . 
While Cornyn made a pitch for the latest proposal , known as Graham-Cassidy , Cruz continued to assert he was undecided -- and was even more explicit at one point , saying Senate leaders still do n't have his vote . 
In a joint session with Cruz at the Texas Tribune Festival , Cornyn called the junior senator "enormously constructive" in the Senate and pledged to support him as he seeks a second term . 
Cornyn said he recently had breakfast with Cruz and they agreed it was important to set aside their differences -- mainly on tactics , not policy -- in the wake of Hurricane Harvey . 
"I think it 's really important , particularly in light of the challenges brought by this huge natural disaster , that we stand together as a Texas delegation and there 's no space between Sen. Cruz and me when it comes to doing work for our state ," Cornyn said . 
Cruz said Graham-Cassidy has some "very good elements" but does not do enough to lower health insurance premiums . 
The authors took the changes but removed them a day later , Cruz said . 
Cornyn had previously declined to endorse Cruz for re-election , saying he was "not going to get involved in any primary races , particularly with my colleagues in the Senate ." 
And Cruz refused to back Cornyn when he was seeking re-election in the 2014 primary . 
"Right now they do n't have my vote , and I do n't think they have Mike Lee 's either ," Cruz said . 
Watch Smith 's full interview with Cornyn and Cruz below . 
In 2018 , Cruz is facing a challenge from U.S. Rep. Beto O'Rourke , D-El Paso . 
Cruz has been generally tight-lipped about O'Rourke , but he went further than usual at the festival while responding to a question about his opponent . 
"I do n't think Texans want a far-left Democrat in the Senate ," Cruz said .

John Cornyn says he 's supporting Ted Cruz for re-election in 2018 .