Weeks after Montana Republican Gov. Greg Gianforte’s son called on him to veto a bill to ban gender-affirming healthcare for minors, the governor signed the legislation into law Friday, making Montana the 11th state in the past three months to enact full or partial bans on transition surgery, hormonal treatment, and puberty blockers for youths. Gianforte’s son, David, is nonbinary and uses he and…