They do not "validate" or "invalidate" laws. They interpret the US Constitution and find the laws cited in the cases they review either Constitutional or Unconstitutional. But they cannot pick and choose at random which laws they will rule on. The cases they review have to work their way through the entire Federal Court System before they reach the Supreme Court (if they ever do).
Committees, commissions, and boards are appointed by both the president and congress.
by veto
No, the president is not elected by Congress. In the United States, the president is elected through a process known as the Electoral College. Under this system, citizens vote for electors who then cast their votes for the president. Congress does have a role in certifying the election results, but they do not directly elect the president.
This process is called a veto.
Congress must present every passed bill and resolution to the President.
no, The process of impeachment is an option of the Congress.
Of course, this process is known as impeachment of a president and needs an organized vote in congress
The Speaker of the House is in charge of the House of Representatives in Congress, while the Vice President serves as the President of the Senate. The Speaker and the Vice President oversee the legislative process, manage debates, and ensure the smooth functioning of their respective chambers.
The president determines whether to sign or veto bills passed by Congress.
The President cannot unilaterally declare war without the consent of Congress. The President has to present evidence to Congress that a war would be necessary and legal. Thus Congress acts to check the President's power.
The president can veto any bill passed by Congress. This stops a divided Congress since a 2/3 majority is required to pass the bill over the veto. The president can fail to enforce laws that he does not like. Congress can fight back with impeachment or censure but there are usually serious political costs to such actions, so Congress often does nothing. The president can also use a "carrot and stick" approach to influence individual Congress members.
This deals with the system of Checks & Balances. The President can "check the authority of Congress" by rejecting a unconstitutional law proposed by Congress. this process is called veto.The President checks Congress when he vetoes a bill that the Congress has passed. Congress can check him if a 2/3 majority votes to override his veto.Also, the President can check Congress by using the media (the "bully pulpit") to set the agenda for Congress. Presidents also tend to have success with Congress proportional to their approval rating with the public. Thus, if a president has a high approval rating, it is likely that Congress will be willing to help him accomplish his goals.