Vegas Gambler in Insider Case Echoes Trump Attacks on FBI Leaks

• Gambler Billy Walters presses appeal claiming unfair probe • Justice Department probes agent accused of improper media tips

It’s not just President Donald Trump complaining about FBI leaks.

So are defense lawyers in three white-collar crime cases in New York, as they try to scuttle prosecutions by claiming that FBI leaks of grand jury material were so damaging the charges can’t stand. Las Vegas gambler Billy Walters, who was convicted of insider trading last year, has made the issue the centerpiece of an appeal that’s set to be heard Tuesday.

The argument may be a long shot because judges have rejected such ...