Share on Twitter Former President Donald Trump’s lawyers said on Tuesday the US Senate lacks the authority to conduct his impeachment trial now that he has left office, while the Democratic lawmakers due to serve as prosecutors called him singularly responsible for the deadly 6 January attack on the Capitol. Mr Trump’s legal team and the nine House of Representatives Democrats set to prosecute him filed briefs with the Senate one week before the trial is scheduled to begin. His lawyers focused on an argument that last week won the support of 45 of the 50 Republicans in the 100-seat Senate in a failed vote to dismiss the case because Mr Trump is a private citizen, having left office on 20 January.