The power of the president to veto laws and the power of the House of Representatives to impeach are examples of O federalism
O checks and balances
O the unwritten constitution
executive privilege

Checks and balances

Explanation:

The answer would be checks and balances because the Constitution of the United States explains that the senate and the house of represenatives shall make up the legislative branch.

Therefore, since it is in the constitution, it can not be option 3.

It can not be option one because fedarlism refers to the federal government and the local/state government governing a geographical area which has nothing to do with the president being able to veto laws or the House of Representative being able to impeach.

This leaves only option 2 left which sound like the best answer to this question.

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four sitting presidents have been assassinated while in office but the first was abraham lincoln,

it is a : ) always outside of government control