After asking "do may a favor" and talking about Biden and we to not know what else was on the call since its not a full transcript and he will not allow anyone that was on the call to testify (hide the rest of it).
And one final point on that. Let us assume (for the sake of the argument) that you meant to say "do me a favor". I have news for you: that phrase is not to be found in the transcript either. Despite being frequently employed by Trump haters of all flavors, this is a distortion of his words.
Trump never said "do me a favor", meaning that he never asked for a personal favor. What Trump said in reality was "do us a favor", obviously (look at the context) meaning the country. Maybe once in a while it would not hurt to check out the original source. Your conspiracy theory regarding "blackmail" does not hold water, alas...