A nurse is assisting in the care of a newborn immediately following birth. The nurse notes mucus bubbling out of the newborn's mouth and nose. Which of the following actions should the nurse take first?

Place the newborn in the Trendelenburg position.

Administer saline drops into the newborn's nares.

Suction the newborn's mouth with a bulb syringe.

Perform deep suctioning of the newborn's trachea with an endotracheal tube.