Georgia Rep. John Lewis, the Democratic civil rights icon, has endorsed impeachment proceedings in the House after withholding his opinion on the matter for several months.

Lewis said in a speech on the House floor Tuesday morning that “we cannot delay” and now is the time to act. His comments as Democrats have questioned whether President Donald Trump improperly used his office to pressure the Ukrainian president to investigate political rival Joe Biden and his son.

Lewis is one of the most influential Democrats in his caucus and an ally of House Speaker Nancy Pelosi, who has so far discouraged impeachment. His comments come as several other Democrats endorsed proceedings Tuesday. Lewis said he’s been “patient while we have tried every other path” and “the future of our democracy is at stake.”