No, the Congress can't veto a bill. It is the Presidentwho can. Congress is the Legislative Branch of government, and it is their job to make the law by passing bills. The President is the head of the Executive Branch of government, and it is his option to either sign or refuse to sign a given bill.
Yes, buit in most cases his veto can be overridden by a 2/3 vote of both houses. The veto is most effective at getting Congress to make changes that the President wants, when there are enough votes in Congress to sustain a veto.
Congress can overide a veto that the president made.
Not, it's the other way around. A veto allows the president to reject a bill from Congress.
Congress passes the legislation while the president can sign or veto it.
The President does have the power to veto Congressional legislation that comes to him for approval. However, Congress has the ability to override his veto with two thirds of the Congress.
He/she can veto any legislation that congress passes.
The President has the power to veto congressional legislation.
The President can veto it,but the Congress can surpass the President's veto with a 2/3 vote.
an override
Bills can't be passed without the president's involvement on some level. The president signs it, or vetoes it. If Congress over-rides the veto, the bill becomes law no matter what the president does. In that case the president cannot exercize another veto.
Checks and Balances
Your terminology is not quite correct. Congress does not veto a veto, it overrides a veto. And the reason for doing so would be that the members of Congress are determined to have their way. If they can muster enough votes, they have the power to put through their legislation, with or without the approval of the President.
Every legislation or the enactment passed in the congress require an assent of the president to come into force. Veto power is the power of the president to send back the legislation or the enactment passed in the congress. Once it is sent back it requires to be passed with the majority of the votes of members of the congress.
The President needs more than one way to pass or veto legislation because it he pockets it congress can't override the veto.
He can veto a bill proposed by Congress. Then again, Congress can check the President by overriding the veto with a 2/3 majority vote from both houses.