Adam Schiff says whistleblower may not testify in impeachment probe

House IntelligenceChairman Adam Schiff indicated Sunday that the whistleblower at the heart of Democrats’ impeachment inquiry againstPresident Donald Trump might not testify over concerns about the person’s safety.Schiff’s remarks come after Trumpdramatically escalated his attacks on the whistleblower and as he repeatedly calls for the official to be unmasked.Trump’s unrelenting barrage has spurred worries from Democrats that congressional Republicans might try to reveal