Senator Bob Menendez denies allegation he hired prostitutes . Watch head that surfaced allegations now questions tipster 's credibility . ' ` ` Peter Williams '' wo n't talk directly to investigators , watchdog head says . Additionally , any issues concerning Dr. Melgen and the IRS have been fully resolved and satisfied . '' Senate Ethics Committee wo n't confirm whether it is true .
Senator Bob Menendez denies allegation he hired prostitutes . Watch head that surfaced allegations now questions tipster 's credibility . ' ` ` Peter Williams '' wo n't talk directly to investigators , watchdog head says . Senate Ethics Committee wo n't confirm whether it is true .