O'Brien's Lawyers Cross-Examine Key Government Witness

Lawyers for former state probation commissioner John O'Brien and his co-defendants have launched a two-day assault on the character and motivation of a key government witness.

Francis Wall, a top deputy to O'Brien, has testified that he did "everything and anything" to assist his boss' alleged scheme to rig hiring at the probation department.

WBUR's David Boeri joins Morning Edition to discuss the cross-examination.