The NHS says it will interview staff at Leeds General Infirmary about their "working practices" before rubber-stamping the reopening of the hospital's children's cardiac unit.
In a statement, NHS England said it would review the "governance of the unit" and speak to staff caring for children where "incidents or complaints" had occurred.
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Michael Fallon has received reassurances from his US counterpart that security ties with Britain will "endure" following a vote for Brexit.
On Friday, police said it appeared the girl had shot herself in the face with the weapon.
The showers will be slow-moving, heavy and thundery at times, particularly in central and eastern areas.