Obama's Alleged Red Line Comment Regarding Syria

Could anyone provide a contemporaneous QCL (quote cite & link) for me?

I have done some searches but could not find it. TIA

“A red line for us is we start seeing a whole bunch of chemical weapons moving around or being utilized,” Obama said in August 2012. “That would change my calculus.”

Link.

5 Seconds on Google.

Thank you, for some reason my searches did not hit it.