According to a Harvard law professor and House Democrat witness in favor of impeachment, Constitutional impeachment hasn't happened until the House notifies the Senate. Both versions, old and new, depend on the House officially communicating the fact of impeachment to the Senate. That communication has always taken place in short order after the House voted to impeach. The reason lies in the core element of what impeachment is by its very nature: a prosecution by the House that takes place before the Senate. If the message is not sent and the trial is not prosecuted, there is no genuine impeachment in the constitutional sense of the term. ... According to the longstanding understanding of impeachment, Pelosi has some modest leverage over the Senate trial. With the authority the House has given to her, she can control when impeachment officially occurs. Constitutionally, the Senate can’t try Trump until she triggers the trial by sending a message about impeachment to the Senate. The Constitution gives the House has the “sole power” of impeachment; and impeachment means the power to initiate and conduct a prosecution in the Senate. But if Trump has already been impeached by the House vote, then Pelosi has zero leverage, because the Senate can start the trial right away, without waiting for the House to initiate or conduct the prosecution. After all, the House only has the power to impeach. If it has already executed that power, then the ball is already in the Senate’s court. The Senate has the sole power to try the impeachment. Sure, the Senate’s rules say the trial starts “when the managers of an impeachment shall be introduced at the bar of the Senate.” But that’s because the Senate rules understand impeachment in the traditional sense, to require communication from the House and commencement of a trial. If the brand-new theory is right, however, the Senate can just amend its rules and start the trial now. McConnell, not Pelosi, would then control the trial’s timing. https://www.bloomberg.com/opinion/a...chment-why-can-t-the-senate-start-a-trial-now So either Trump hasn't been impeached, and Pelosi has some leverage solely in when the trial starts, or he has been impeached, and McConnell is free to start the trial, without or without the House sending managers to prosecute it.