have a/ finger on the button

have a/your finger on the button

to be the person who controls the nuclear weapons (= weapons that use power made by dividing atoms) that a country has and decides whether to fire them If Europe has its own nuclear deterrent, whose finger would be on the button?

Common Names:

Name	Pronounced	Usage
Burr	[bə:]
Charlize	-	Southern African, Afrikaans
Emma	EM-ə (English), EM-mah (Finnish), E-mah (German)	English, French, Italian, Spanish, Swedish, Norwegian, Danish, Icelandic, Finnish, Dutch, German, An
Reynolds	['renəldz]
Vano	-	Georgian
Moriah	mo-RIE-ə (English)	Biblical, Biblical Hebrew, English (Modern)