How do the foreign policy powers of the legislative and executive branches establish a system of checks and balances between these two branches of government

The legislative branch is made up of the House and Senate, known collectively as the Congress. Among other powers, the legislative branch makes all laws, declares war, regulates interstate and foreign commerce and controls taxing and spending policies.

arresting and exicuting citizens

whose power in the senate is equal to the power of the speaker of the house?