When a defendant meets the threshold showing for psychiatric assistance under Ake v. Oklahoma, what conditions satisfy the showing and what standard of review applies to the denial of such assistance?

1. When this Court held in A/re v. Oklahoma that an indigent defendant must make a threshold showing that their sanity would be a significant factor at trial, what are the conditions that satisfy that threshold showing? 2. If a defendant meets the threshold showing, is the denial of psychiatric assistance under Ake v. Oklahoma subject to structural or harmless-error analysis? 3. Once a threshold showing is met does the 6th Amendment right to the Assistance of Counsel apply to mental illness pleas in the context of independent psychiatric assistance as it relates to an examination, and assisting in evaluation, preparation and presentation of an affirmative defense?