Trump's legal team, led by White House counsel Pat Cipollone and Trump personal lawyer Jay Sekulow, is challenging the impeachment on both procedural and constitutional grounds, claiming Trump has been mistreated by House Democrats and that he did nothing wrong.
Trump's attorneys argue that the articles of impeachment are unconstitutional in and of themselves and invalid because they don't allege a crime. Trump was impeached by the House on one count each of abuse of power and obstruction of Congress. Under the Constitution impeachment is a political, not a criminal process, and the president can be removed from office is found guilty of whatever lawmakers consider “high crimes and misdemeanors.”