Senate Majority Leader Mitch McConnell commented on what he thinks motivates Democrats to pursue impeachment for President Trump Tuesday morning on the Senate floor:
SEN. MITCH MCCONNELL: The spent four weeks demonstrating through their actions that impeachment is actually not that urgent, and they don't actually have much confidence in their case -- an arbitrary four-week delay does not show urgency.
And these demands that the Senate commit to re-opening the House's investigation do not show confidence. There's a reason why the House inquiry that led to President Nixon's resignation took 14 months of hearings, in addition to the separate special prosecutor. There is a reason why the Clinton impeachment investigation drew on years of investigations and mountains of testimony from firsthand fact witnesses.
That's because both of those Houses of Representatives knew they had to prove their case -- prove their case -- before submitting it to the Senate for judgment. Both situations involved legal battles over executive privilege, extensive litigation both times, not after a trial had been handed to the senate, but beforehand.
When the case was actually being compiled. Mountains of evidence, mountains of testimony, long legal battles over privilege, and none of this discovery took place over here in the Senate. The constitution gives the sole power of impeachment to the House. If a House majority wants to impeach a president, the ball is in their court, but they have to do the work. They have to prove their case. Nothing, nothing in our history or our constitution says a House majority can pass what amounts to a half-baked censure resolution and then insist that the Senate fill in the blanks.
There's no constitutional exception for a House majority with a short attention span. Look, I think everyone knows this process has not been some earnest fact-finding mission with House Democrats following each thread wherever it leads. The Speaker of the House did not reluctantly decide to impeach after poring over second-hand impressions of civil servants. That was a predetermined political conclusion. Members of her conference had been publicly promising it literally for years. That's why the investigation stopped long before the House had come anywhere near proving what they allege.