Democrats demand former adviser John Bolton testify at Trump’s impeachment trial

Washington • The stakes over witness testimony at President Donald Trump’s impeachment trial are rising now that a draft of a book from former national security adviser John Bolton appears to undercut a key defense argument — that Trump never tied withholding of aid to Ukraine to a demand the country investigate rival Joe Biden..Bolton writes in the forthcoming book that Trump told him that he wanted to withhold hundreds of millions of dollars in security aid from Ukraine until