Darline Graham has officially filled the South Carolina Senate seat left vacant by the death of her brother, Sen. Lindsey Graham.

Sen. Chuck Grassley (R-Iowa) swore Graham in just after 2:30 p.m. Tuesday on the Senate floor amid applause from colleagues and staff. Graham was escorted on the floor by Sens. Tim Scott (S.C.) and Katie Britt (Ala.). She shook Grassley’s hand but did not make a separate speech.

Republicans’ swift move to fill the late senator’s seat maintains the party’s already slim margin in the chamber as it tries to advance priorities before August recess.

Graham — who makes history as the first woman to represent South Carolina…

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