Trump impeachment: whistleblower will not testify in public, Democrats say

* Battle for national opinion begins ahead of Wednesday hearings* Ex-national security adviser John Bolton signs book deal* How Trump’s hardball tactics put the constitution in perilDonald Trump in Atlanta on Friday. Photograph: Evan Vucci/APThe whistleblower who sparked the impeachment inquiry into Donald Trump will not testify in public, House intelligence chair Adam Schiff said.“The committee ... will not facilitate efforts by President Trump and his allies in Congress to threaten