Final answer:
A bill can be handled by the President by signing it into law, vetoing it, allowing it to become law without a signature after 10 days, or pocket vetoing it if Congress adjourns within the 10-day period.
Step-by-step explanation:
When a bill reaches the President of the United States, there are several actions that can be taken. The President may sign the bill into law, which makes it effective immediately or on a specified future date. Alternatively, the President can veto the bill by sending it back to Congress with objections, where it will need a two-thirds majority in both the House and the Senate to override the veto and pass it into law. If the President neither signs nor vetoes the bill within 10 days (excluding Sundays), the bill automatically becomes law without the President's signature, unless Congress adjourns during that period, which leads to a 'pocket veto,' thereby preventing the bill from becoming law.