[RoosterRedux]

I just watched what I think was the presser and he said he PROBABLY wouldn't be doing the debate.

That might be the wrong presser, of course.

[Red Steel]

Then later on in the presser I believe I heard Trump say he would definitely not do the debate.

From the Washington Post that directly quotes Corey Lewandowski:

https://www.washingtonpost.com/news/post-politics/wp/2016/01/26/trump-will-definitely-not-participate-in-fox-debate-campaign-says/