SANTA FE, N.M. (AP) — Republican U.S. Senate candidate Gavin Clarkson works as an expert legal witness on Native American economic issues and lives in an experimental tiny home that is 15 feet (4.5 meters) long and wide, according to new financial disclosure filings disclosed Friday.

Clarkson is one of two GOP candidates seeking the Senate nomination; both were handily defeated last year running for other statewide offices in New Mexico.

Clarkson, who asserts Choctaw heritage, has recently used his expertise in tribal finance and economic development to work as a college professor, private con...