Senate Majority Leader Harry Reid Harry Mason ReidDemocrats fear Russia interference could spoil bid to retake Senate Graham signals support for confirming a Supreme Court nominee this year Trump signals he will move to replace Ginsburg 'without delay' MORE (D-Nev.) is raising the specter of impeachment to rouse Democratic donors with less than a week before the midterm vote.

In a fundraising email to members of the Progressive Change Campaign Committee (PCCC), Reid warns that a Republican-controlled Senate could lead to a congressional effort to impeach President Obama.

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“Frankly, a Republican House and Senate could go beyond shutting down the government — they could waste months of our lives on impeachment,” Reid writes.

The Senate leader encourages the group’s 1 million members to give money in support of candidates in Alaska, Colorado and Iowa — all states where Democrats are in close races.

The PCCC has had some success marshaling its supporters in favor of progressive candidates in the past.

But Reid's fundraising email comes at a time when Republicans are increasingly optimistic about their chances of netting the six Senate seats needed to capture control of the upper chamber. GOP candidates have pulled ahead in races that could swing Senate control and are close in seats Democrats had expected to hold easily.