The documents show a high school resource officer who was also a sheriff's deputy and two school counselors recommended in September 2016 that Cruz be committed for mental evaluation under Florida's Baker Act. (nbcmiami.com)
It's hard to force anyone, let alone the President of United States, to undergo an involuntary mental evaluation (which is what the linked NYT letter was asking for). (politics.stackexchange.com)
Remember, a serious mental evaluation requires some time to perform, and if it's involuntary that means you have to place them in custody. (politics.stackexchange.com)