President Joe Biden implored Americans in an op-ed published on Sunday not to forget the Jan. 6, 2021, attack on the US Capitol, writing that the country has a collective obligation to remember the events of that day.The article, published in The Washington Post, comes a day before the US Congress will meet to formally certify Republican Donald Trump’s election as president and nearly four years after a mob of his supporters stormed the Capitol in a failed bid to block the certification of his 2020 election loss.For all the latest headlines, follow our Google News channel online or via the app.“We must remember the wisdom of the adage that any nation that forgets its past is doomed to repeat it,” Biden wrote.“We cannot accept a repeat of what occurred four years ago.”He added that the election certification process would be peaceful this time around.Biden has consistently portrayed Trump as a threat to democracy, and he has pointed to Trump’s failure to accept defeat in the 2020