Will Trump stick to his script tonight or will he veer off and start winging it?

Tonight is Trump's big televised pitch to the nation about the wall and the government shutdown.

Undoubtedly his aides have prepared a speech for him. Will he be able to stick to it (as he did during the first State of the Union address) or will he veer off and do his own thing (like his rallies)?
Update: Looks like he stuck to the script the whole way through. I'm impressed!
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