Jeremy Corbyn said he had "lost count" of the prime minister's explanations for her "grotesquely reckless" Brexit delays.
"The prime minister continues to say it is her deal or no deal, but this House has decisively rejected her deal and has clearly rejected no deal," he told MPs.
"It is the prime minister's obstinacy that is blocking a resolution."
Mr Corbyn says Labour will get behind another EU referendum if the party can't get its own Brexit proposals through Parliament on Wednesday.
If Mrs May's Brexit deal gets through Parliament next month, Labour wants it to be put to a public vote - with remaining in the EU as the other option.
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