The House Judiciary Committee is holding an impeachment hearing Monday where committee lawyers are presenting evidence in the case, as Democrats begin to draft articles of impeachment against President Trump at the direction of House Speaker Nancy Pelosi.

The committee is expected to receive the “presentations of evidence” from Judiciary Committee Majority Counsel Barry Berke and Intelligence Committee Majority Counsel Daniel Goldman. Stephen Castor will serve as counsel for Republicans on both the Judiciary and Intelligence Committees.

At the center of the impeachment inquiry is Trump’s efforts to press Ukrainian President Volodymyr Zelensky to launch politically related investigations—regarding former Vice President Joe Biden and his son Hunter’s dealings in Ukraine, as well as issues related to the 2016 presidential election. The president’s request came after millions in U.S. military aid to Ukraine had been frozen, which Democrats have argued shows a “quid pro quo” arrangement. Trump has denied any wrongdoing.