Each of the three branches of government has a degree of control over the actions of the other branches of government.
The Executive Branch carries out most government activities, and establishes governmental policy. It also proposes most laws to be considered by the Legislative Branch, and proposes the annual governmental budget.
The legislative branch can approve, amend or reject proposed bills, and it gives thorough review to the budget submitted to it, and can make changes to the budget within limitation specified in the Constitution.