Washington (AFP) – Lawmakers probing the 2021 attack on the US Capitol subpoenaed former president Donald Trump Friday to testify on his involvement in the violence, in a major escalation of their sprawling inquiry. The summons came after the House panel of seven Democrats and two Republicans voted unanimously last week to compel Trump’s appearance before investigators. It requires the 76-year-old Republican to produce documents by November 4 and to appear for a deposition beginning on or around November 14 — the Monday after the crucial November 8 midterm elections. “As demonstrated in our h…