Agreement or collaboration between two parties. In the US and UK, where the national legislatures have tended to be dominated by two parties, bipartisanship can be seen to represent a political consensus, most often relating to foreign policy. The separation of powers often requires an element of bipartisanship, and, as entrenched within the US constitution, this can be seen within the US Congress and in relations between the Congress and the President. It has a similar effect to the system of cohabitation in the French system of government. Bipartisanship is prevalent in foreign policy, often appealing to a unified conception of national interest, but can be seen to stifle criticism and may be used by dominant parties to keep potentially divisive issues off the political agenda.