what vote is necessary in the House to achieve an impeachmeant?

Answer 1

The impeachment process is as follows:

The House holds an investigation and calls a committee. Based on the evidence, the House decides whether there are ground for impeachment. If so, it votes for each article of the impeachment, which requires a simple majority of those present to pass.

Any article that is passed then goes to the Senate, which requires a 2/3's majority to convict.
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Answer 2

Majority of those present and voting, presuming a quorum is present.