Lawmakers probing the 2021 attack on the US Capitol voted on Thursday to subpoena former President Donald Trump to testify on his alleged role in the violence, in a major escalation of the sprawling inquiry weeks before it is due to wind up. During what was expected to be its final hearing before the midterm elections, the House panel of seven Democrats and two Republicans agreed unanimously to compel Trump’s appearance before investigators. “We need to be fair and thorough and gain a full context for the evidence we’ve obtained. But the need for this committee to hear from Donald Trump goes b…