The head of state may also dismiss office-holders. There are many variants on how this can be done. For example, members of the Irish Cabinet are dismissed by the president on the advice of the taoiseach; in other instances, the head of state may be able to dismiss an office holder unilaterally; other heads of state, or their representatives, have the theoretical power to dismiss any office-holder, while it is exceptionally rarely used. In France, while the president cannot force the prime minister to tender the resignation of the government, he can, in practice, request it if the prime minister is from his own majority. In presidential systems, the president often has the power to fire ministers at his sole discretion. In the United States, the unwritten convention calls for the heads of the executive departments to resign on their own initiative when called to do so.