At least 26 other states have restricted gender-affirming care for minors.
Votes last month suggested that backers of a Kansas ban have the legislative supermajorities needed to override Kelly's veto. House Minority Leader Brandon Woodard, a Kansas City-area Democrat, acknowledged as much during a recent news conference and said opponents will ask state courts to overturn a ban.
Supporters argue that a ban would protect vulnerable children from what they've often described as a radical ideology about gender.
Transgender youth and their parents have said such care often lessens depression and suicidal tendencies.
Kelly chastised lawmakers in her veto message for what she said was their attempt to interfere with parental rights and in medical decisions.