In a live post-debate "Kelly File," Frank Luntz talked to a focus group of Republican voters. 

The group expressed their dissatisfaction with the performance of Donald Trump.

Overall, Luntz noted that the majority of the group had a positive view of Trump going in, but that was not the case by the end of the two-hour debate.

Luntz said that his reaction meters showed a very negative response to Trump refusing to rule out a third-party run. 

When asked which candidates surprised them, the voters pointed to Mike Huckabee and Ben Carson. 

Watch the segment below.