Mystery grows after Mike Pence cancels trip to New Hampshire

Vice president Mike Pence has generally been a consistent source of stability in a Trump administration renown for chaos, but he swapped roles with the president this week after he abruptly cancelled a planned trip to New Hampshire.Mr Pence had reportedly already boarded Air Force Two at Joint Andrews Base in Maryland when he abandoned his trip to Salem, where he was due to participate in a roundtable discussion and deliver remarks on the opioid crisis.But Mr Pence never arrived in New Hampshire