SIOUX FALLS, S.D. — Annette Bosworth, a defeated Senate candidate, was arrested on Wednesday and charged with several counts of perjury and filing false election documents. The state authorities said she had fraudulently attested to gathering voter signatures when she was actually on a Christian mission trip to the Philippines.

The state attorney general, Marty Jackley, charged Ms. Bosworth, 42, with six counts of perjury and six counts of filing false documents. On Tuesday, she lost the Republican primary with 6 percent of the vote.

Ms. Bosworth turned herself in at the Minnehaha County Jail and was immediately released.

At a news conference, she called the charges “a political intimidation scheme” against her by Mr. Jackley, who was initially appointed by former Gov. Mike Rounds.

Mr. Rounds defeated Ms. Bosworth and three other Republicans on Tuesday night to capture the Republican nomination for the Senate seat held by Tim Johnson, a Democrat who is retiring.