 She was reelected in November 2018, defeating Republican Knute Buehler 50.0% to 43.9%, with Independent Party nominee Patrick Starnes, Libertarian Party nominee Nick Chen, Constitution Party nominee Aaron Auer, and Progressive Party nominee Chris Henry taking the remaining votes.In a November 2018 budget plan Brown proposed a 30-year plan to limit Oregon's greenhouse gas emissions via a "cap-and-trade" system.In 2019, after a measles outbreak in Oregon, she urged parents to vaccinate their kids.