Have a/(one's) finger on the button phrase
Have the power to launch a nuclear attack, especially used to imply that the president of the United States
A: Speaking of the nuclear bomb, do you know who has a finger on the button in the US? B; The president, I guess.
What if the president of the US has a finger on the button?
The verb "have" must be conjugated according to its tense.
The origin of this phrase is not clear.
Confusion made worse than before.
There was heavy traffic on the way to work this morning. Confusion worse confounded when some drivers were arguing with each other right in the middle of the street.