The national survey, taken as the House of Representatives planned an impeachment vote and the Senate a trial, showed Trump defeating former Vice President Joe Biden by 3 percentage points, Vermont Sen. Bernie Sanders by 5 points, and Massachusetts Sen. Elizabeth Warren by 8 points.

In hypothetical head-to-head contests, Trump also led South Bend, Indiana, Mayor Pete Buttigieg by 10 points and former New York City Mayor Michael Bloomberg by 9.

Polls taken nearly a year before an election are hardly a reliable indicator about what the eventual outcome will be, especially when the other nominee hasn’t been chosen. But the findings do indicate that impeachment hearings detailing what critics see as Trump’s violations of the Constitution and his oath of office haven’t undermined his core political support.