Chia-Chi Teng, a professor at Brigham Young University, desires to seek the Republican nomination for U.S. House, in the upcoming special election. He is temporarily out of the country, and is in China. He attempted to file but was thwarted by a Utah law that requires candidates to file in-person at the elections office. See this story.
It is possible Utah is the only state that requires candidates to file in person. A few years ago the Utah law was relaxed to excuse presidential candidates from appearing in person. The lawsuit has a hearing in state court on June 12.