We are going to need more facts for this. What do you mean by "full support" versus "itinerary or supplementary support?"
I can respond in a general sense... You need data to show the student needs the support you're asking for. What do you mean by "records" show serious struggle? Has there been a school evaluation? That is what you need to refer to in order to show a need. Point to struggles/deficiencies shown by the school evaluation and other data (grades, teacher comments, etc.) and make sure it is documented in the present levels. If it's there, it needs to be addressed with accommodations. Ask the team: "Why aren't you providing the support that the present levels show the student needs?" If the school evaluation/present levels don't show a need, you can disagree with the school evaluation and request an IEE (Independent Educational Evaluation) at school expense. Unfortunately, school districts do not have to follow the recommendations in an IEE, but they do need to consider them.