Federal Rule of Civil Procedure 47(a) provides that a 'court may permit the parties or their attorneys to examine prospective jurors or may itself do so.' (emphasis added). The Rule thus places the decision as to whether to have the parties or the judge conduct voir dire firmly in the discretion of the district court. See, e.g., Csiszer v. Wren, 614 F.3d 866, 875 (8th Cir. 2010) ('Federal Rule of Civil Procedure 47(a) expressly permits a district court to conduct voir dire itself.'); Morrissey v. B.G. Danis Co., 779 F.2d 51, 1985 WL 13810, at *1 (6th Cir. 1985) ('Under Federal Rule of Civil Procedure 47(a), the district court has broad discretion to control and conduct the examination of prospective jurors during voir dire.'). Rule 47(a) further provides that, '[i]f the court examines the jurors, it must permit the parties or their attorneys to make any further inquiry it considers proper, or must itself ask any of their additional questions it considers proper.' (emphases added); see also Eisenhauer v. Burger, 431 F.2d 833, 836 (6th Cir. 1970) ('The scope of questions permitted to be asked on voir dire examination is generally a matter addressed ...