In the United States, Democrats have unveiled two articles of impeachment against President Donald Trump in a historic step asserting the U.S. President abused his oath of office and deserved to be removed. The charges emanate from allegations that Trump promised Ukrainian president vital military aid in a meeting at the White House in exchange for an investigation into former U.S. Vice President, Joe Biden’s business deals in Ukraine. He is also accused to have pressed Ukrainian President Zelensky to lie about Russian interference in the 2016 presidential election, which he won. Here is Professor of Legislation at Columbia University, Professor Richard Briffault.