Which preposition to use with removable

at Occurrences 7%

Tunis and Tripoli are regencies of the Port of Tunis, having an hereditary Bey, while Tripoli is a simple Pasha, removable at pleasure.

by Occurrences 7%

Those relations require that his Majesty should be represented, not by a person removable by the House of Assembly, but by a Governor sent out by the King, responsible to the King, and responsible to the Parliament of Great Britain.

from Occurrences 1%

Although the debate covered the whole ground, embracing the Treasury as well as all the other Executive Departments, it arose on a motion to strike out of the bill to establish a Department of Foreign Affairs, since called the Department of State, a clause declaring the Secretary "to be removable from office by the President of the United States."

Which preposition to use with  removable