Republican Senator Dean Heller will face a challenge from Democrat Jacky Rosen in the 2018 general election.
In an email to reporters, Nevada's 3rd District Congresswoman says she is seeking the Democratic nomination for Senator in next year's election. She went on to say that an official announcement would come soon.
Considered a political outsider, Rosen worked as a computer programmer, software designer and president of a synagogue in Henderson until seeking office last year. She only narrowly defeated her opponent, perennial Republican candidate Danny Tarkanian.
Since taking office, Rosen has been an outspoken critic of both the Republican-majority in Congress and the Trump Administration.
Heller, for his part, is likely facing a difficult re-election campaign. Many political commentators have named the incumbent as the most vulnerable sitting Republican in the nation, and his possible support -- or lack thereof -- of a GOP-backed healthcare law may make that re-election bid more difficult.
The Associated Press contributed to this story.