The Bush administration is pressing the Iraqi government of Nouri al-Maliki to issue a “broad” and “painful” amnesty for insurgents in spite of intense opposition to the proposal from politicians both in Iraq and the US, according to a senior administration official.

Amid growing anxiety in Washington over Iraq’s escalating sectarian violence, the US is advocating more determined moves towards a national reconciliation with the Sunni community that dominates Iraq’s insurgency. It also wants a tougher line on the Shia militias.