Trump impeachment trial resumes for final arguments

US President Donald Trump's impeachment trial resumed for final arguments today before an expected acquittal later in the week that Democrats have said will be invalid because no witnesses testified.The President was impeached in December for abuse of power over pressure on US ally Ukraine to announce investigations that would have helped him politically, including into Joe Biden, a leading challenger for this year's presidential ballot.

Biden is among the candidates Monday in the Iowa caucuses that choose the state's Democratic nominee and mark the official start of election season. The selection process in largely rural Iowa, coinciding with final impeachment arguments in Washington, will be closely watched as a sign as to which of 11 Democratic candidates are gaining early momentum to challenge Trump in November's election.