What is the test for denying a defendant's opportunity to cross-examine a witness for bias?

The denial of a defendant's opportunity to impeach a witness for bias is reviewed for harmless error. United States v. Figueroa, 548 F.3d 222, 231 (2d Cir. 2008) (citing Delaware v. Van Arsdall, 475 U.S. 673, 684 (1986)). "While the Sixth Amendment guarantees the right to cross-examine witnesses at trial, the scope and extent of cross-examination are committed to the sound discretion of the trial judge." United States v. Salameh, 152 F.3d 88, 131 (2d Cir. 1998). In this, judges have "wide latitude." Van Arsdall, 475 U.S. at 679.