ex·pos·tu·late 
(ĭk-spŏschə-lāt′)
(ĭk-spŏschə-lāt′)v. ex·pos·tu·lat·ed, ex·pos·tu·lat·ing, ex·pos·tu·lates
v.intr.
To reason earnestly with someone in an effort to dissuade or correct; remonstrate. See Synonyms at object.
v.tr.
To say in protest; object: "[He] expostulated that they had every right to hold a street meeting" (Pierre Berton).
[Latin expostulāre, expostulāt- : ex-, intensive pref.; see EX- + postulāre, to demand; see prek- in the Appendix of Indo-European roots.]
ex·pos′tu·lation n.
ex·postu·la′tor n.
ex·postu·la·to′ry (-lə-tôr′ē), ex·postu·la′tive adj.