Kathie Lee Gifford -- If Matt Lauer Leaves 'Today' ... We'll Revolt!

Kathie Lee Gifford says there will be a "revolt" at NBC if the powers that be allow Matt Lauer to leave the "Today" show, telling TMZ ... she'll do whatever it takes to keep him around.

Kathie Lee was leaving Rockefeller Center in NYC Monday morning when she made it clear -- she thinks Matt has been unfairly demonized in the media in the wake of Ann Curry's firing.

Kathie tells us, she wanted to buy a full page ad in an NYC newspaper defending her longtime co-worker, but Matt talked her out of it.