I assume he approached her under an assumed name with a fake company. He punked Donald Trump for those who think Sarah is a dunce for falling for this (not that I think you
think that, Buckeye).
About an hour ago I read Sarah's post about this incident on her Facebook page. The company that contacted her seemed legit. She wrote that she took off her mic during the interview and walked away. She also gave Baron Cohen permission to use the footage even if it was heavily edited just to show how bad Baron Cohen would show himself to really be.
The really crappy thing is Sarah wrote that the production people deliberately dropped her and her daughter off at the wrong DC airport so they would miss their flight back to Alaska.
However within about 15 seconds you can see on Trump’s face that he thinks the whole thing is nonsense and he walks out in barely over a minute.