Congressman-elect Charles Djou (R-Hawaii) will be sworn into Congress Tuesday afternoon, the office of Speaker Nancy Pelosi (D-Calif.) announced Tuesday.

Djou beat out two Democratic opponents, former Rep. Ed Case and state Sen. Colleen Hanabusa, in a Hawaii special election last weekend. 

The contest was held to replace former Rep. Neil Abercrombie (D), who has resigned to run for governor. 

Djou's victory was the first time a Republican won a special election for a seat held by Democrats since 2001.

The Republican won 39.5 percent of the vote and benefited from Case and Hanabusa splitting 58.4 percent of the vote, respectively 30.8 and 27.6 percent. 

Democrats remain confident they can hold the seat, which is in a traditionally Democratic district, in the fall.

But Republicans believe Djou can hold on for victory.

Djou's district is where President Barack Obama spent much of his childhood. Obama won 70 percent of the vote there in the 2008 presidential election.