Alaska Gov. Bill Walker and Lt. Gov. Byron Mallott have formally filed for re-election in 2018, confirming an informal announcement made by Mallott to Juneau media earlier this month.

Walker is a former Republican turned independent and Mallott is a Democrat, but the two filed as non-partisan candidates according to a statement from their campaign team Monday. The two men, running independent and Democratic campaigns for governor in 2014, joined forces under a “unity ticket” to defeat incumbent Republican Gov. Sean Parnell.

"Serving as governor for the people and state I love has been the honor of a lifetime,” Walker said in the statement. “This is a job that requires the kind of hard work and tough decision making I have always faced. Byron Mallott and I have refused to put off the difficult decisions because doing so would jeopardize future generations. We believe that independent leadership that relentlessly puts Alaska's priorities first is critical to finishing the work we have started to stabilize and build Alaska."

Walker and Mallott will each have to gather 3,213 signatures to appear on next year’s general-election ballot, which they will be required to submit on Aug, 21, 2018 – the date of the primary election. In the meantime, they will campaign separately under special fiscal rules.

“As separate candidates, they can participate in shared campaign activities so long as each candidate shares an equal cost of the activity and files a shared campaign activity form with the Alaska Public Offices Commission,” campaign officials wrote.