For the first time in two decades, a pair of Virginia senators are expected to compete with one another in a general election.

Sen. Bill Stanley (R) announced Thursday that he would move and seek reelection in November in the newly redrawn 20th district — which is currently held by Sen. Roscoe Reynolds (D).

Stanley’s Southside Virginia district was split into four during the redistricting process, with 40 percent of his old district drawn into the one Reynolds holds.

“As you can see from the results of the Democrat-controlled redistricting process, the 19th District has been sliced-and-diced into four different Senate districts,’’ Stanley said at a news conference Thursday. “I consistently opposed the hyper-partisan gerrymandered efforts of the Senate Democrats.” 

Stanley won a special election earlier this year. Reynolds has been in the Senate since 1997.

The new map, approved last month by the Democratic-led Senate, also merges the districts of the Roanoke-Lynchburg region’s Republican senators, Ralph K. Smith and Stephen D. Newman.

Smith announced Thursday that he would move and seek reelection in the newly redrawn 19th district, Stanley’s current district.