Impeachment by Secret Ballot?

Donald Trump's Impeachment hearings have begun at a TV channel near you, and based on the evidence already available in the public domain, it appears that the US House of Representatives is very much likely to impeach the 45th President. That would make him the 3rd of that select group to have faced this ignominy - Andrew Johnson, who took over at the helm after Abraham Lincoln was assassinated, being the first back in 1868; Bill Clinton being the 2nd, in 1998. (Richard Nixon resigned in August ...