While the power of the presidency is typically checked by the other two branches of government, presidents have the unencumbered power to pardon those convicted of federal crimes and to issue executive orders, which don’t require congressional approval but lack the permanence of laws passed by Congress. In matters concerning foreign policy, presidents have at their disposal the executive agreement, which is a much-easier way for two countries to come to terms than a treaty that requires Senate ratification but is also much narrower in scope.
Presidents use various means to attempt to drive public opinion and effect political change. But history has shown that they are limited in their ability to drive public opinion. Favorable conditions can help a president move policies forward. These conditions include party control of Congress and the arrival of crises such as war or economic decline. But as some presidencies have shown, even the most favorable conditions don’t guarantee success.