Are Brady claims available for defendants who plead guilty when the prosecution withholds materially exculpatory evidence?

QUESTIONS PRESENTED I. Are Brady Claims available for defendants who plead guilty when the prosecution withholds materially exculpatory evidence? II. Does a guilty plea waive a defendant’s due process claim that his conviction was based on perjured testimony and false evidence? Ill. During the trial court proceedings, the trial judge barred the petitioner's counsel from reviewing and investigating undisclosed evidence that was presented to him on the day of jury selection. 1. Does a trial courts interference with counsel’s duty of investigation and refusal to allow counsel to investigate late discovery violate a defendant’s Sixth Amendment right to effective assistance of counsel? 2. Can a defendant challenge the voluntariness of his. guilty plea if his plea is the result of counsel being unprepared for trial due to being barred by the trial court from reviewing all the evidence to the State’s case?