President Donald Trump tore into his election challenger Joe Biden as a threat to the “American Dream” in a bruising speech Thursday accepting the Republican nomination for a second term against a backdrop of racial tensions and the deadly coronavirus pandemic. The former celebrity real estate developer spoke at a grandiose event staged at the White House — the first time a president has ever held a party convention at the executive mansion — and followed up with a vast fireworks display on the National Mall. In his 70-minute address, Trump went after Biden as hard as he could, attacking him by name dozens of times in an attempt to define the veteran centrist former vice president, who leads in polls ahead of the November 3 election, as a radical leftist. “No one will be safe in Biden’s America,” he said.“This election will decide whether we save the American Dream,” Trump said, rejecting Biden’s main campaign slogan about saving America’s soul. “He’s the destroyer of America’s jobs and given the chance, he’ll be the destroyer of American greatness.” The relentless verbal assault contrasted with Biden’s own acceptance speech at the Democratic nomination last week, which lasted only 25 minutes and, while delivering caustic critiques of the Trump presidency, avoided mentioning his name.Despite Trump’s warnings of chaos, his bid for reelection is already taking place amid levels of turmoil the country hasn’t seen for decades. Covid-19 has killed more than 180,000 Americans so far, while the nation’s painful reckoning over racial justice was playing out outside the White House where a Black Lives Matter protest, complete with shouting and vuvuzela trumpets, was audible inside the fences.Trampling over etiquette Trump spoke from the White House’s South Lawn, which he had transformed into a flashy event center for the final night of the Republican convention.Trampling over long-running presidential custom to separate the so-called “people’s house” from political campaigning, Trump had some 1,500 white chairs laid out in front of the stage bedecked with rows of US flags and two giant video screens. The immense fireworks displayed featured Trump’s name written in fiery letters in the sky.