Because he would have lost the vote. FWIW, the democrats need only 25 rino votes to win a vote in the house. And there are at least 25 rino's who would have voted against this and not threatened their seats at all because they are in rino districts.
It would have been a major defeat, in public, for record, and he knew it.
The dems control Senate and presidency and are only 25 votes away in the House.
So what? They should have forced the vote and got EVERYONE on the record, and then let the chips fall where they may.