Labour would likely vote against any Brexit deal Theresa May secures with Brussels, a senior frontbencher has suggested.
Shadow foreign secretary Emily Thornberry said she "can't see" the government coming back with an agreement that meets Labour's six tests.
The tests include delivering the "exact same benefits" as the UK currently has as members of the single market and customs union, and "ensuring a strong and collaborative future relationship with the EU".
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Speaking on Friday, Ms Thornberry said Labour would not "agree" to an eventual deal - nor back a "no-deal" exit.
She told the Financial Times: "I can't see them coming back with a deal that is going to meet our six tests and I can't see them coming back with a deal that will unite the Tory party...
"We're either going to have a general election in the autumn or we're going to have it in the spring."
She added: "Even if [the government] comes back in October, November, and they say, 'this flimsy bit of paper is what you're going to have to agree to, otherwise there'll be no-deal'. We're not going to agree to either of those."
A Labour source told Sky News: "Our policy is unchanged, but like a lot of shadow frontbenchers Ms Thornberry is pessimistic about the prospects of this government negotiating a good deal."