FILE – In this Feb. 27, 2019 file photo, House Agriculture Committee Chairman Rep. Collin Peterson, D-Minn., asks a question on Capitol Hill in Washington. The 2020 election poses a dilemma for conservative Republican voters like Minnesota farmer Jeff Ampe. He likes his incumbent Democratic congressman, Chairman Peterson. He also likes Peterson’s leading GOP challenger, former Lt. Gov. Michelle Fischbach. The 75-year-old Peterson says he won’t decide until January or February whether he’ll seek a 16th term, and Fischbach still must secure the Republican nomination.(AP Photo/Jacquelyn Martin File)

Impeachment is turning up the heat on Minnesota Rep. Collin Peterson.

Even though Peterson was one of just two Democrats who voted against opening the House impeachment inquiry, one conservative group has launched a half-million-dollar ad campaign hitting him on the issue.

Peterson looks to have his toughest opponent in years if he seeks a 16th term, and even some voters who have long viewed him as a reliable friend on agricultural issues aren’t ready to commit to supporting him next year.

(Associated Press)