Here's a link to an index of articles related to impeachment and removal from office:
Constitution of the United States - We the People
The House can impeach Trump all they want - with no real restriction - but it take 67 members of the Senate to remove him from office.
The 25th amendment can't be used to permanently remove the President unless 3/4 of both the House and the Senate repeatedly vote to keep him out.
So, a coup by the House of representatives is not possible without extreme support by Republicans in the Senate at least.
You may want to read the rest of the U.S. Constitution sometime....