Democratic vice presidential nominee Tim Walz mischaracterized the nature of the fertility treatments that he and his wife, Minnesota first lady Gwen Walz, used to conceive their two children. 

Gwen Walz said in a statement to CNN on Tuesday that she and her husband used intrauterine insemination, or IUI, to conceive, not in vitro fertilization, or IVF, as the Minnesota governor has claimed on the campaign trail.