No "demand". It was all in his hyperventilating liberal mind. POTUS was on target for a direct strike against the DS and that is what he hyperventilated about. If Radcliff had been allowed to ask the right questions in the direction he wanted to go, this testimony would have ended very quickly and Vindman's guilt would be made obvious; and the "impeachment" moved back to square one. Interesting to read through the Dem interruptions and obstacles during Radcliff's questioning. I'm  getting tired of watching them get all the rope they need to hang themselves, would really like to see them start using it! I know, the show must go on.