Amy Klobuchar, a four-term Democratic senator and frequent critic of President Donald Trump, formally announced on Jan. 29 she is running for governor of Minnesota as tensions flare in the state amid the administration's immigration enforcement surge.

"These times call for leaders who can stand up and not be rubber stamps of this administration, but who are also willing to find common ground and fix things in our state. These times call for grit and resilience," Klobuchar said in an announcement video posted to social media.

"I believe we must stand up for what's right and fix what's wrong. That's why today, I'm announcing my candidacy for governor of the state of Minnesota," she said.

Klobuchar's announcement comes after she filed paperwork on Jan. 22 to form a campaign committee, after current Gov. Tim Walz announced he would end his bid for re-election amid a federal investigation into widespread welfare fraud in the state. Minnesota's precinct caucuses, traditionally the first step in the party endorsement process, begin on Feb. 3.

Contributing: Terry Collins