“The articles of impeachment submitted by House Democrats are a dangerous attack on the right of the American people to freely choose their president,” the document says. “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 lawyers did not deny any of the core facts underlying Democrats’ charges, conceding what ample evidence has shown, that he withheld $391 million in aid from Ukraine and asked the country’s president to investigate former Vice President Joseph R. Biden Jr. and his son, Hunter. But they said Mr. Trump broke no laws and was acting entirely appropriately and within his powers when he did so, echoing the president’s repeated protestations of his own innocence. They argued that Mr. Trump was not seeking political advantage, but working to root out corruption in Ukraine.

“President Trump categorically and unequivocally denies each and every allegation in both articles of impeachment,” Pat A. Cipollone, the White House counsel, and Jay Sekulow, Mr. Trump’s personal lawyer, wrote.