He abandoned the idea, as it would be too difficult to kill the President.
I don't know who's going to try to kill the President.
Unless maybe some bad guys were planning to kill the President and needed to be taken out.
They won't kill the President if they can help it.
"The day after the coup attempt, my secretary complained that they failed to kill the President."
In the letter, he threatened to kill the President.
In them, the policemen announce their intentions to kill the President, or have him out of office.
It was feasible to kill the President, of course.
Surely you would say that someone tried to kill the President.
"Is he ambitious enough to hire someone to kill the President?"