On Friday, Massachusetts Senator Elizabeth Warren became the first 2020 Democratic presidential hopeful to call for impeachment proceedings against President Trump over what she called his repeated efforts to obstruct the Mueller investigation.

Sen. Elizabeth Warren: “I took an oath to the Constitution of the United States. And the Constitution makes clear that the accountability for the president lies through Congress, and that’s the impeachment process.”

Mueller left whether President Trump should be indicted or found guilty of obstruction of justice to Congress. Another Democratic presidential candidate, former HUD Secretary Julián Castro, said it would be “perfectly reasonable” for Congress to begin impeachment hearings. House progressives, including prominent freshman lawmakers Alexandria Ocasio-Cortez and Rashida Tlaib, have called for Trump’s impeachment. That contrasts with senior Democrats, including House Majority Leader Steny Hoyer, who said last week impeachment is “not worthwhile at this point.”