<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.rais wa marekani donald trump na mpinzani wake wa democratic joe biden wameshutumiana kutokana na vurugu zilizotokea huko portland, oregon.  <response>: us president donald trump and his democratic rival joe biden have clashed over the violence that has erupted at protests in portland, oregon. 