© Reuters/ANDREW KELLY FILE PHOTO: Former U.S. president Donald Trump rally in Wilkes-BarreBy Jason LangeWASHINGTON (Reuters) - Days after Democratic President Joe Biden gave a fiery speech attacking former President Donald Trump and his Republican allies as an extremist threat, a Reuters/Ipsos poll completed on Wednesday found a majority of Americans believe Trump's movement is undermining democracy. Fifty-eight percent of respondents in the two-day poll - including one in four Republicans - said Trump's "Make America Great Again" movement is threatening America's democratic foundations. Speaking in Pennsylvania, a key electoral battleground, Biden urged voters to reject Trump and extremism. The Reuters/Ipsos poll found that 60% of Republicans don't think Trump's MAGA movement represents the majority of the party. The latest Reuters/Ipsos poll, conducted online in English throughout the United States, gathered responses from 1,003 adults, including 411 Democrats and 397 Republicans.