Nancy Mace, one of The Citadel’s first two female graduates, is expected to announce Saturday that she will challenge U.S. Sen. Lindsey Graham in next June’s GOP primary.

Mace has indicated she may run and said Thursday she will make her decision known Saturday morning at the Berkeley County GOP breakfast meeting in Goose Creek.

In a separate news release, the county party said Saturday’s meeting will include “a special guest with a huge announcement for the entire state.”

Mace would be the second official Republican challenger to Graham, who has more than $6.3 million in his campaign warchest but whose willingness to compromise with Democrats has angered some in the GOP base.

If Mace runs, she would be Graham’s second primary challenger. Upstate businessman Richard Cash already has announced that he’s in the race.

U.S. Sen. Tim Scott, R-S.C., also is up for election next year for the final two years on former Sen. Jim DeMint’s Senate term, but Scott has drawn no announced challenger to date.

Mace is a wife, mother and small business owner, was one of two women to graduate from The Citadel in 1999.

Saturday’s meeting will begin with a 9 a.m. breakfast at the American Legion Post, 116 Howe Hall Road, and the program will begin at 9:30 a.m.

Reach Robert Behre at 937-5771.