The president of any republic has a task of ensuring the smooth running of the country. He is chief executive and chooses government officials with approval by the senate, he is Chief Legislator and can vet on bills in parliament or use his influence to get them passed.
The President is head of the executive branch. This means that he enforces laws that the legislative branch creates. If the legislative branch wants to make a law they must get a majority in the senate, and in the house of representatives to agree on something (which seems to never happen). When they do agree the bill that they created is sent to the president to sign into law or veto it, which basically means he says no. If after the president vetoes and the senate and house both get 2/3 of each section to vote to override the veto the bill becomes a law.
Other than playing golf and spending billions running Airforce One ragged - he attempts to "fundamentally change the United States of America" with his socialist agenda - but only during his spare time.
He can appoint judges veto laws which means he says no to them he can accept laws and make a bill give a overruled veto to the judicial branch to say it unconstitutional he can veto changes to the constitution he can controll trade between 2 states declare war controll trade with other governments and places and much more hope that's enough Sincerely, Jason, 13
It depends which president you are talking about. If you are talking about Obama, he is doing everything he can to weaken the U.S. He has and will continue to lower the standard of living, destroy our economy and health care system. He is turning the U.S. into a third world country.