The answer is "door-in-the face technique".
The door-in-the-face technique is a sort of sequential request methodology. Usually used to expand compliance rates of a specific demand. Rather than the foot-in-the-entryway method, which introduces a demand with a littler demand that the respondent is bound to concur with, door-in-the-face requests include making an all the more requesting inquiry, trailed by the real demand.