Killgore, you may want to retract your “you’re lying Mr. President”. What was said was:

“I am happy to have any independent fact checker out there take a look at your presentation versus mine, in terms of the accuracy of what I just said”

The response from the republican was:

“That’d be fine, Mr. President”. Not, You’re lying. The sound of the C-Span video is much clearer. Scroll ahead to the 1:20 mark to catch more of the exchange.