On Wednesday, Gov. Steve Bullock called a special election to take place on May 25 to fill Montana’s only seat in the U.S. House of Representatives vacated by Ryan Zinke.

Zinke was confirmed this week by the U.S. Senate as President Donald Trump’s new Interior Department secretary.

Zinke has refrained from participating in dozens of House votes since his cabinet nomination, leaving Montana without representation for most of 2017.

So far, seven Republicans and eight Democrats have filed for candidacy seeking the respective party nominations. The Democratic Party will hold a special nominating convention on March 5.