Attorney General Janet Reno has opened a probe into whether a former top presidential aide lied under oath. Reno today notified a special panel of federal judges that she’s starting a 90-day investigation of Harold Ickes. At issue is whether he committed perjury before a Senate committee investigating Democratic campaign fundraising in '96. Reno's inquiry could lead to naming an independent counsel to investigate the issue. Tomorrow, the attorney general briefs leaders of the House and Senate Judiciary Committees on the investigation. Majority Republicans have been pressing hard for her to turn the campaign finance matter over to an outside court.