Nevada Democrat Jacky Rosen is in a neck-and-neck battle in her bid to return to the U.S. Senate for a second term, while her party lost its slim voting majority in the upper chamber of Congress.

Democratic Sen. Jacky Rosen trailed Republican Sam Brown by less than 1,000 votes as Nevada counties stopped reporting results early Wednesday morning. As of Wednesday at 3 a.m., Brown led Rosen by 870 votes — or 0.

If Brown wins, it could expand Republicans' likely majority in the U.S. Senate. If Rosen wins, it could make controversial bills harder to pass.

Nevada Sen. Jacky Rosen was leading in Nevada’s Senate race against Republican candidate Sam Brown by about 6,000 votes Tuesday night.

Nevada Democratic U.S. Sen. Jacky Rosen and Republican challenger Sam Brown were literally tied after initial election results were released Tuesday night, and by that time the race in Nevada was already irrelevant to control of the Senate,

The two major candidates for Nevada's U.S. Senate seat cast their ballots Tuesday morning as close attention is paid to which party will control the Congression

The race between Nevada Sen. Jacky Rosen and Republican Sam Brown remained too close to call Wednesday morning, separated by only 870 votes as of 9 a.m. Wednesday. Brown was ahead with 47.3 percent of the vote to 47.

In the weeks leading up to Election Day, Republican challenger Sam Brown has chopped the lead in half, closing rapidly on U.S. Sen. Jacky Rosen (D-Nev.) in their U.S. Senate race.