Updated on June 23, 2019:

A standoff in Oregon’s capital continued on Sunday, as Senate Republicans stayed away in an effort to block a climate change bill from passing. Tempers flared over the weekend as Democratic leaders, who favor the bill, said they would fine the absent Republicans for each day they miss in their walkout, and after a floor session was canceled on Saturday amid reports that a militia group intended to hold a protest at the statehouse.

Tensions boiled over in the Oregon Capitol this week as Republican state senators vanished in an effort to delay a vote on a climate change bill they oppose. On Thursday, Gov. Kate Brown, a Democrat, ordered the state police to find them and bring them back.

It was only the latest chapter in a season of partisan division and frustration in the nation’s statehouses, where, for the first time in more than a century, all but one state legislature is dominated by a single party. In Oregon, where Democrats dominate both chambers, Republicans were unapologetic about their efforts to slow the state’s adoption of an emissions-reduction program by disappearing — and keeping the Democrats from having enough lawmakers present to call a vote.

Brian Boquist, one of the Republican senators who went missing, issued what sounded like a warning to any police officer who might try to arrest him.