A patient is orally intubated with a size 7.0 mm ID endotrac…

A patient is orally intubated with a size 7.0 mm ID endotracheal tube. The respiratory therapist uses a size 14 Fr suction catheter to suction the patient’s airway. The suction setting is -100 mmHg. The therapist notices the patient’s secretions are thick and tenacious and will not aspirate through the suction catheter. Which of the following should the therapist do FIRST?