Does the exclusion of evidence in a civil case constitute a constitutional violation?

Defendant also contends that the exclusion of this evidence violated his rights to due process and a fair trial under the Fourteenth and Sixth Amendments of the United States Constitution. Though the Attorney General argues that defendant's federal constitutional claims have been forfeited, we need not resolve this issue. Assuming that defendant's claims have been preserved, he cannot show a constitutional violation. "The 'routine application of state evidentiary law does not implicate [a] defendant's constitutional rights.' [Citation.]" (People v. Hovarter (2008) 44 Cal.4th 983, 1010.) Since the exclusion of the challenged evidence in this case was permissible under state rules of evidence, it did not rise to the level of a federal constitutional violation.