Article snippet: WASHINGTON — House investigators are asking former national security adviser John Bolton to testify in their impeachment inquiry, deepening their reach into the White House as the probe accelerates toward a potential vote to remove the president. Democratic lawmakers want to hear next week from Bolton, the hawkish former adviser who openly sparred over the administration’s approach to Ukraine — in particular, President Donald Trump’s reliance on his personal attorney Rudy Giuliani for a back-channel operation. Bolton once derided Giuliani’s work as a ‘‘drug deal’’ and said he wanted no part of it, according to previous testimony. Bolton’s attorney, Charles Cooper, said Wednesday evening that his client would not appear without a subpoena. The Democrats are also calling John Eisenberg, the lawyer for the NSC who fielded an Army officer’s concerns over Trump’s phone call with the Ukraine president, and Michael Ellis, another security council official, according to a person familiar with the invitation and granted anonymity to discuss it. The rush of possible new witnesses comes as the House prepares to take its first official vote Thursday on the process ahead. That includes public hearings in a matter of weeks and the possibility of drafting articles of impeachment against the president. The White House has urged officials not to testify in the impeachment proceedings, and it’s not guaranteed that those called will appear for depositions, even if they receive sub... Link to the full article to read more