The right of legation is the right that a state has to send a diplomatic mission to a foreign state. The right of legation also covers the right to receive diplomatic missions from other states.
A state also has the right of diplomatic intervention, meaning if an envoy from a foreign country is considered to be suspicious, the receiving state has the right to decline the entry of the envoy. No legal liability is incurred by the state for refusing to send or receive diplomatic representatives. Because this right remains on a common consent level, it is not considered a natural right. Many states have no interest in receiving diplomats from other foreign states.