Two quotes that are against the Pre-tribulation theory.

When I began this study of Revelation twenty-two years ago, what I really had in mind was finding scriptural support for the Seven-year Tribulation view that I was so confidently teaching. I was just as convinced as everyone else that there was going to be one. So the surprise of my life came when I couldn't prove that view from Scripture. ("The False Prophet," by Ellis H. Skolfieldpage 39)*

Dave MacPherson writes, "Over the years I've privately contacted hundreds of the best-known evengelical scholars in regards to their prophetic views. The vast majority... harmonizes 1 Thessalonians 4's coming with Matthew 24's coming, but the general public doesn't know this. If just a minority ...  were to publicly reveal their positions, pretrib dispensationalism would receive a death blow." (The Rapture Plot, Simpsonville, SC, Millennium III Publishers, page 233)

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*He believes the beast in Revelation 13 is Islam, other than that, none of his prophetic interpretation is correct.