Impeachment Committees Ask Bolton to Testify

House investigators are summoning 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.

But Bolton's lawyer, Charles Cooper, says Bolton will not appear without a subpoena.

Democrat 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...