WASHINGTON (AP) — President Donald Trump’s legal team issued a fiery response Saturday ahead of opening arguments in his impeachment trial, while House Democrats laid out their case in forceful fashion, saying the president betrayed public trust with behavior that was the “worst nightmare” of the founding fathers. The dueling filings previewed arguments both sides intend to make once Trump’s impeachment trial begins in earnest Tuesday in the Senate. Their challenge will be to make a case that appeals to the 100 senators who will render the verdict and for an American public bracing for a presidential election in 10 months. “President Donald J. Trump used his official powers to pressure a foreign government to interfere in a United States election for his personal political gain,” the House prosecutors wrote, “and then attempted to cover up his scheme by obstructing Congress’s investigation into his misconduct.” Trump’s legal team, responding to the Senate’s official summons for the trial, said the president “categorically and unequivocally” denies the charges of abuse and obstruction against him. “This is a brazen and unlawful attempt to overturn the results of the 2016 election and interfere with the 2020 election, now just months away,” the president’s filing states.