Impeachment: President Trump told House Republicans at a party retreat that they must retain control of the chamber in the midterm elections, saying he expected to face a third impeachment if Democrats retake the majority. “They’ll find a reason to impeach me,” Mr. Trump said. “I’ll get impeached.” He warned about the history of midterms going against the party that holds the White House and said trumpeting his administration’s policies was a “road map to victory.”

They need a majority in house and senate to impeach and convict. Conviction is how Trump is removed, impeachment just means he did enough to investigate any wrongdoing.
Correct. I was thinking about the presidential chain of succession and didn’t mention the Senate. A simple majority in the house is needed to pass articles of impeachment. Then two-thirds of the Senate must vote to convict and remove the president.