rty—either to prove or disprove the validity or amount of a disputed claim or to impeach by a prior inconsistent statement or a contradiction." Fed. I. Evid. 408(a). Inadmissibility under Rule 408 provides a basis to quash a Rule 17(c) subpoena. See 49 See Order, dated Feb. 16, 2021 (ECF No. 120), at 2