Impeachment: even the Senate's oath is controversial in hyperpartisan age

Trump’s trial opened with senators taking a 232-year-old pledge of impartiality – but that’s where the unanimity endedAt 2.08pm on Thursday, a pair of pages opened the filigreed doors of the Senate. A quartet of senators – two Republicans and two Democrats – escorted the US supreme court’s chief justice, John Roberts, dressed in a long black robe, into the chamber. So began the Senate impeachment trial of Donald Trump.Chuck Grassley, the Senate’s preside