at the disposal of
(idiomatic) At one's disposal.
In The Bob Hope Golf Classic (LWT) the participation of President Gerald Ford was more than enough to remind you that the nuclear button was at one stage at the disposal of a man who might have either pressed it by mistake or else pressed it deliberately in order to obtain room service. Clive James
By capital we understand everything that, from the special use by the individual, or from its being placed at the disposal of others, produces a revenue or rent. We do not inquire into its origin, or ask whether it has been acquired by inheritance or by labour. Albrecht Thaer
Non-violence is the greatest force at the disposal of mankind. It is mightier than the mightiest weapon of destruction devised by the ingenuity of man. Mahatma Gandhi
Asking people for money is giving them the opportunity to put their resources at the disposal of the Kingdom. Henri Nouwen
Time and those waves are at the disposal of anyone who wants to use them. Frank Zappa