British lawmakers have voted on eight different possible Brexit options, but none received the majority support that would clarify the UK's course.
Parliament is trying to find an alternative to Prime Minister Theresa May's twice-rejected EU divorce deal.
Lawmakers voted on Wednesday on options that included leaving the European Union without a deal, staying in the bloc's customs union and single market, putting any EU divorce deal to a public referendum, and cancelling Brexit if the prospect of a no-deal departure gets close.
The strongest support was for a plan to stay in a customs union with the bloc after Brexit, which was defeated by eight votes: 272-264.
Lawmakers plan to narrow the list of options down and hold more votes on Monday.
Britain has until April 12 to find a new plan - or crash out of the EU without a deal.
The Northern Irish Democratic Unionist Party that props up May's government says it won't support her Brexit divorce deal, a blow to her hopes of winning approval for the agreement in Parliament.
But Britain's former foreign secretary, Boris Johnson, a longtime foe of May's EU divorce deal, now plans to vote for it.
Conservative lawmaker Conor Burns, an ally of Johnson's, said the former foreign secretary told a meeting of pro-Brexit lawmakers that he would back the deal.
The shift came soon after May told Conservative Party lawmakers that she will step down if her twice-rejected deal is approved and Britain leaves the European Union.
Johnson is highly likely to be a contender in any Conservative leadership contest that follows May's departure.
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