Does the Fourth Amendment require warrants for border searches of electronic devices?

QUESTIONS PRESENTED I. Does the Fourth Amendment require that searches of electronic devices at the United States border be conducted pursuant to a warrant based on probable cause or, at the very least, pursuant to a reasonable suspicion that the devices contain evidence of a crime related to the rationale behind the border search exception? Il. | Whether a defendant’s conduct of filming a minor using the bathroom and taking a shower caused the minor to engage in sexually explicit conduct under 18 U.S.C. § 2251(a) where all of the minor’s actions on film do not qualify under the statutory definition of “sexually explicit conduct?” ii