UPDATE -- Vote Postponed: It’s crunch time for Boehner. Still unclear if he has votes to pass his debt plan.

UPDATE @ 5:33 PM: The vote has been postponed. Boehner clearly doesn't have 216. Via Ryan Grim:

Boehner is pulling his bill from the floor. Oh lord. This sucker could go down.

The vote could still be later tonight. Depends how many arms get twisted -- and broken.
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Via National Journal, Boehner needs 216 to pass his debt plan -- and the vote is expected around 6 PM ET:

Rep. Maurice Hinchey's, D-N.Y., office has told National Journal that he will not be voting today, as he has not all week. That, combined with Rep. Gabrielle Giffords, D-Ariz., still being away, means that with two vacancies there will be, at most, 431 Members voting tonight. Therefore, House Speaker John Boehner needs 216 votes to pass his bill. Without any Democratic help, he can still now lose 24 Republican votes if all the rest of the total 240 Republicans show up and vote his way.

It looks like all the Democrats will oppose Boehner's plan, so this is an intra-GOP battle.

National Journal counts 23 GOPers voting no with three leaning no and six undecided.

Think Progress has been diligently tracking the GOP no votes in this post and on Twitter. They're count is at 26.

The Hill's Whip Count is 24 No votes from Republicans.

And, this from Bob Cusack at The Hill:

House Republican leaders are still looking for the votes to pass Speaker John Boehner's (R-Ohio) debt-limit bill.

Boehner and his lieutenants are publicly expressing confidence, but their actions clearly show that they are still rounding up support. Boehner on Thursday afternoon was seen lobbying members, seeking “yes” votes in what is the biggest vote of his Speakership.

Note from John: Another thing probably causing problems for Boehner is the fact that this bill is dead on arrival in the Senate. Members of Congress often don't like voting on controversial legislation that isn't going anywhere. The vote puts them on the record, permitting their opponents to use it against them in the next campaign. In this case, the Teabaggers could use the vote against House Rs (to claim they're not conservative enough), and Democrats could use the vote as well, to show how House Republicans want to gut Medicare and Social Security, etc.

It's hard to explain to your own caucus why they have to fall on their sword for a vote to nowhere.