Speaker of the U.S. House of Representatives Nancy Pelosi announced on September 24 that the House would initiate a formal impeachment inquiry against President Trump, charging him with “betrayal of his oath of office, betrayal of our national security and betrayal of the integrity of our elections.”

This announcement comes alongside allegations that Trump pressured the president of Ukraine to open a corruption investigation of former Vice President Joseph R. Biden Jr., a leading contender for the 2020 Democratic presidential nomination, and his son. It was the final push Democrats, who have been warily holding back from impeachment proceedings for months, needed to move into more confident action.

Impeaching Trump is still a major risk for the Democrats. Whether successful or not, the fallout will be deep and enduring. Here are ten risks for the Democratic Party: