"The president could come right before the committee and talk, speak all the truth that he wants if he wants," Pelosi said. "Or he could do it in writing. He has every opportunity to present his case."
Trump testified in writing during special counsel Robert Mueller's investigation into Russian meddling in the 2016 presidential election. However, Mueller noted in congressional testimony earlier this year that the president was not always entirely truthful in his answers, Reuters reported.
Democrats launched the impeachment inquiry after learning of a whistleblower complaint filed in August by an official concerned over Trump's attempts to get Ukrainian officials to investigate former vice president and 2020 presidential hopeful Joe Biden.
Trump has denied any wrongdoing.
Lawmakers prepared this week to hear from several officials as part of the second week of public testimony in the impeachment inquiry. Officials said U.S. Ambassador to the European Union Gordon Sondland, former special envoy to Ukraine Kurt Volker and former White House advisor on Russia Fiona Hill were among those scheduled to appear for congressional testimony this week.