Senate Democrats will call up votes on witnesses and documents at the outset of President Trump’s impeachment trial Tuesday afternoon, setting up an immediate partisan battle that is likely to last the length of the trial.

Senate Minority Leader Chuck Schumer, a New York Democrat, told reporters he’d force a vote “right off the bat” to subpoena the administration for documents related to Trump’s call with the president of Ukraine in which he asked for help investigating former Vice President Joe Biden and Democrats.