Jimmy Kimmel takes another whack at Jay Leno, unveils the ‘Ken Burns’ documentary ‘The Late Night War’

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First, he put on a big chin. Then he told Jay Leno himself just how low he had sunk.

Now, with just one day left until Conan O’Brien signs off of ‘The Tonight Show’ to make room for the return of Leno, Jimmy Kimmel squeezed in yet another attack on NBC and Leno.

On last night’s ‘Jimmy Kimmel Live,’ Kimmel unveiled the ‘Ken Burns’ documentary ‘The Late Night War’ — easily his most effective Leno assault yet.

— Denise Martin