New rules on gender identity at schools are causing a stir in Portugal, where some parents are expressing alarm that transgender children will be able to choose which bathroom they use. Right-of-center opposition politicians chided the center-left Socialist government for the rules on Thursday, with some disproving lawmakers asking the Constitutional Court to intervene. An online petition against the directive surpassed 23,000 signatures in two days, newspaper opinion pages weighed the advantages and disadvantages, and social media provided a platform for outraged parents worried that boys might enter girls’ bathrooms. A schools’ directive, issued last week, says children can make choices that correspond with their gender identity, including choosing a bathroom, wearing a girl’s or boy’s school uniform or using their new gender name.