Pelosi and McConnell are on an impeachment collision course

The party leaders will need to work together to avoid a government shutdown just as House Democrats are moving to impeach Trump.

Nancy Pelosi and Mitch McConnell are attacking each other in increasingly pointed terms as House Democrats burrow deeper into their impeachment inquiry.

But if the top two congressional leaders can’t find a way to come together soon, the government could plunge into a shutdown and any last hopes for legislating before the presidential election will vanish.

The speaker and Senate majority leader have been trading grievances increasingly over...