Obama Brought to Stammering Halt ... By Mel Gibson

7/29/2010 2:47 PM PDT

'The View': Obama -- Ask About Mel Gibson

President Barack Obama is usually pretty good at handling the tough questions ... but when the ladies on "The View" brought up Mel Gibson this morning, dude looked pretty damn frazzled.

It all went down during a pop culture lightning round on this morning's show -- in which the POTUS admitted that he knew about Lindsay Lohan's jail stint ... and kinda, sorta dissed Snooki.

Check out the clip.