go to the capital and check for himself. Or he can have it sent to him. He is the president.
If the Senate does not agree with the treaty presented to them by the President they do not have to accept it.
The House of Representatives can impeach a president with a majority and the Senate can remove a president from office with 2/3s of the vote. If actions are unclear or just suspected, they can launch an investigation to get the full details.
As part of the Legislative Branch, the Senate has the power to override a veto from the President. The Senate also has to approve treaties negotiated by the Executive Branch. The Senate also approves some appointments by the President, like federal judges, members of the Supreme Court, and ambassadors to other nation s. The Senate also acts as the "jury" during impeachment of a president. It checks the President by requesting monthly reports from the White House about the President's actions.
concerning treaties and apointments
The president checks the actions of the legislative branch through vetoes on bills passed by Congress.
Arguably, the ultimate check on the power of the president is impeachment - if the president is thought to have committed a crime in the course of his duties, the House of Representatives can vote to impeach him, and then the Senate conducts the trial. A conviction requires a 2/3 majority vote of the Senate, and the highest punishment it can impose is removal from office. One could also argue that the voters are the ultimate check on the president's power - if they don't like his policies, they can vote him out in the next election. Furthermore, the Constitution (through the 22nd Amendment), limits the President to two terms in office, which prevents the President from becoming too powerful.
Writes bills.
The person who writes a check is called the payor. Or in the case of my brother, a sucker, when he writes another check for his girlfriend.
If the senate ties (it doesn't have to be 50-50), then the Vice President of the US votes to break the tie. It's the only case in which the VP is allowed to vote in the Senate.
Even after the House and Senate pass a bill, the President has a chance to accept or reject it.
The federal courts can check the Presidents power by that courts can declare executive actions unconstitutional.
President of the SenateThe Vice President is the President of the Senate. He presides over the Senate and casts the tie breaking vote.In reality, however, this position is more symbolic. The President Pro Tempore presides over the Senate in the Vice Presidents absence (which is often) and the Majority Leader has most of the power.For more information, check out these websites:(The Current Senate Leadership)http://www.senate.gov/pagelayout/senators/a_three_sections_with_teasers/leadership.htm(General Leadership) http://www.senate.gov/reference/reference_index_subjects/Leadership_vrd.htm