Sen. Ted Cruz, R-Texas, explained on ABC News on Sunday that he thought a military attack against Syria was "a mistake."

Cruz explained that he did not support authorizing President Obama to take military action because his administration wasn't acting in America's self-interest and didn't have a plan for success.

Obama's argument that it was important to enforce "international norms," Cruz added, was not convincing.

"I don't think that's the job of our military to be defending amorphous international norms," Cruz said. "There are other steps we can do to express strong disapproval to Assad's murderous conduct but I don't think it's the job of the military."