Via Wonkette:

And here he is lying about it:
State Sen. David Schultheis said he didn’t intend for a Twitter post accusing President Barack Obama of “flying the U.S. plane right into the ground” and ending with “let’s roll” as a threat or a reference to United Flight 93, which crashed during the 2001 terrorist attacks.
“Let’s roll” reportedly were the last words of Todd Beamer before he and other passengers tried to gain control of their hijacked jet. The plane crashed into a Pennsylvania field short of its intended target.
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“‘Let’s roll.’ It’s a comment people use all the time any more. ‘Let’s get going. Let’s move on. Let’s make major changes,’ ” Schultheis said. “I can see it now. But you’re busy doing jillions of things during the day. You sometimes don’t analyze every single word.”
http://wonkette.com/412160/meet-americas-greatest-colorado-state-senator-dave-schultheis#more-412160