A 62-year-old male smoker (45 pack-years) presents with a 3-week history of persistent cough and hemoptysis (approximately 80 mL over 2 days). Flexible bronchoscopy is performed under local anesthesia with conscious sedation. The endoscope reveals a friable, bleeding endobronchial mass **marked A** in the left mainstem bronchus, with surface oozing and partial obstruction of the bronchial lumen. Which of the following is the MOST appropriate next step in management of this patient?