(CNN) Mitch McConnell's life is about to get a lot more complicated.

As soon as Friday, the Democratic-controlled House will vote on a privileged resolution to terminate President Donald Trump's invocation of the National Emergencies Act to secure funding to build a wall on the country's southern border. Speaker Nancy Pelosi (Calif.) has penned a letter urging all members of Congress to vote for the resolution and, given the Democratic majority in the chamber, it seems certain to pass.

Which means that it will be sent to the Senate. Where it will be required by law to be voted on within 18 days. Which could well be the longest 18 days of the Senate Majority Leader's political life.

As CNN's Michael Warren wrote way back on February 12 when considering the political impact of Trump declaring a national emergency on the wall:

"Doing so could set off a chain of events on Capitol Hill that risks splitting the Republican conference, undercutting other parts of Trump's agenda and likely opening the administration's actions to legal challenges. It may also provide a clarifying moment that Republicans on the Hill have managed to avoid since Trump took office -- casting an up or down vote on whether to build the full-scale wall Trump desires."

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