Play first and continue to scroll relatively slow for dramatic effect
Continuing from the inclusion of all of the Presidents rolls (which are pretty self explanatory) there are many things the President can't do without approval from one of the other branches or not at all. When its comes to being the Chief Legislator he does have the power to veto any law that has made it past the Judiciary, however Congress can nullify the veto and allow the law to pass. Also any legislation proposed by the president doesn't even have to be considered within Congress. Of course as Chief Executive the President does hold the power of executive orders withing the United States and executive agreements within other countries, but then again these orders are only official while the current President is in office and can be ratified by the preceding one. Of course there's also the power to appoint agencies, but the Senate can still deny the approval of anything or anyone the President decides to appoint. Hell, there's even checks with his Commander in Chief privileges, sure he's the head of the military and all but Congress holds the power of the purse and can deny the president funding when sending out troops and even if he does send out troops the President also has to notify the Legislative Branch of and extended troop deployment within 48 hours of them actually having been deployed which is stated in the War Powers Act of 1973. But even with all of the regulations weighed unto the President he still holds his seat as the Chief of his/her political party and is an immense supporter to have on your side on political issues if the interest group or candidate is of the Presidents party. Evidently over time this force the President has held has greatly increased, and sure his power may not be absolute within the government, there are work-arounds, meaning the way the constitution is interpreted by each successor has become more cunning and even to this day even Obama is using his powers to veto and that of his executive orders to gain the upper-hand against the currently majority-republican Congress. And to think the President has to do all of this bickering while looking good on camera when attending formal occasions or rallies for causes he supports. In order to not come off negatively from the media to the populace, the President has many issues he must address publicly to the people as the face of the government, as the face of the United States--currently he seems to be working on appealing to the younger audience or the more tech-savvy social media outlet by coming off as friendlier, more comedic in many senses, and most of the reactions to his satiric stunts have been quite positive.
The Executive branches main role when it comes to foreign policy lies within the Presidents Job to be Chief Diplomat (along with Chief of State, Chief Executive, Commander in Chief, Chief Legislator, Chief Jurist, Chief of Party, and Chief Economist, though this example is highlighted for comedy reasons). Being the Chief Diplomat means that the President is the face of the country when it comes to foreign alliances or affairs, and it is best that he represents the country as a whole as a friendly territory which embraces its neighbors, and all of their cultural differences which either remain within the country and are respected or are brought along by immigrants into the states. Since America is such a culturally diverse country being on good terms with many other countries is essential in keeping peace within its borders and outside for trade and monetary reasons. Another thing when it comes to foreign policy is that the President can make or negotiate treaties with foreign nations. While the Legislative and Judiciary branches stay at home maintaining order, the President maintains a peace with other nations, though the job does become worse when you add in all the before-mentioned roles he has, and at home he definitely has a lot on his hands in being the Chief of State and appealing to the people of the United States, not just those outside.
But in all seriousness, lets say something where to happen to the President, then the one to take command would be the Vice President, and even from that there is a presidential line of succession as a precaution for all contingencies.
The list goes as follows: