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Wisconsin Gov. Scott Walker (R)
Walker, once seen as a potential dark horse in the GOP presidential primary, plans to drop out of the race Monday evening. The New York Times was first to report the news. A major Walker donor confirmed his intention to drop out to Business Insider.
Walker has a news conference scheduled for 6 p.m. ET.
The Times' Patrick Healy and Alexander Burns wrote that Walker "concluded he no longer has a path to the Republican presidential nomination and plans to drop out of the 2016 campaign." Walker's campaign did not respond to multiple requests for comment from Business Insider.
Walker is perhaps best known for his battles with public sector unions in Wisconsin. Earlier this year, he raised eyebrows with a surprisingly strong performance in a poll of voters in Iowa, an influential early-voting state. More recently, Walker has polled at the bottom of the Republican field and he received little screen time in the GOP debate last Wednesday.
Walker becomes the second major Republican candidate to bow out of the race, joining former Texas Gov. Rick Perry.