[1][2] Republican nominee and former Arizona Senate president pro tem Debbie Lesko won a closer-than-expected race against Democratic challenger Hiral Tipirneni.

Incumbent representative Trent Franks announced on December 7, 2017, that he would resign effective January 31, 2018, after admitting allegations regarding the issue of surrogacy.

Arizona's resign-to-run law does not require someone to resign if they file to run when they are in the final year of their term.

[7] Additionally, complaints were filed against former state senator Debbie Lesko over her campaign finance records.

[8] Individuals with Clint Hickman and Kimberly Yee Each candidate received 13 write-in votes in the primary.