Jeremy Corbyn has insisted that Labour will not block the planned departure from the European Union.
There has been talk that the party may vote against invoking Article 50 if it can not get certain guarantees about Britain's exit from the bloc.
But the Labour leader maintained that Brexit would be happening.
"We respect the referendum. We voted for the referendum. The result was the result we got", he told the Andrew Marr Show.
"It wasn't the one we wanted, but we have to respect it. Therefore there is going to be a departure from the European Union".
The prime minister has been warned not to expect a preferential trade deal with the US by a senior German minister.Read the full story ›
The Scottish First Minister said it "simply cannot be right" that the prime minister could opt to leave the EU without a vote by parliamentRead the full story ›
The European Union and Canada signed a free trade agreement on Sunday after seven years of negotiations and last-minute delays.
The deal, known as the Comprehensive Economic and Trade Agreement (CETA), is designed to boost growth and jobs and following weeks of uncertainty due to opposition in part of Belgium.
Canadian Prime Minister Justin Trudeau signed the treaty along with the heads of EU institutions, which should pave the way for it partially enter into force early in 2017 with the removal of most import duties.
The Parliament of Belgium's Wallonia region has voted in favour of a planned EU-Canada trade deal, ending a political deadlock.Read the full story ›
Theresa May has said that the breakdown in talks for a free trade union between Canada and the EU would have no bearing on the UK's own attempts to carve out a deal with Brussels.
The prime minister said she was "disappointed" by the blocks hit by the planned CETA deal but did not believe that they reflected on the UK's likely ability to get its own trade agreement with the bloc after Brexit. "We are not seeking to replicate an existing model," she told MPs in a statement. "We will be developing our own British model."
Mrs May also announced that parliament will be given the chance to discuss the terms of Brexit in a series of debates starting within weeks.
The discussions would take place both before and after Christmas, she added.
Asked if she was undermining the UK position, she said: "You can't undermine something that doesn't exist."Read the full story ›
Belgium said it had been unable to clear the way to approve an EU-Canada trade deal because a single region remains opposed.
"I have officially told Tusk that we have no agreement," said Belgium's Prime Minister Charles Michel after a meeting with regional leaders in Wallonia.
The Wallonians' implacable opposition threatens to derail the CETA trade agreement, which was seven years in the making.
Canada said it was "impossible" to continue talks last week, while the EU had given Belgium until Monday to hold crisis talks in the hope of reaching a compromise.
Michel said he was still open to dialogue with leaders in Wallonia, and that it was too early to say whether CETA was dead.
The breakdown of the talks has also highlighted the challenges faced by Theresa May as she attempt's to strike her own deal with the EU after the vote for Brexit.
Belgium has been given until Monday evening to back an EU trade deal with Canada.
The Canadians have said they are "ready to sign" the historic deal and all 28 EU government back the Comprehensive Economic and Trade Agreement.
However, it has been held up because the regional government of the French-speaking region of Wallonia in Belgium has refused to give the go-ahead, saying the deal is bad for Europe's farmers and gives too much power to global corporate interests.
Reuters reported that EU trade officials are offering tweaks to a political declaration appended to the treaty in a bid to get them to sign.
European Council President Donald Tusk is reportedly due to speak to Belgian Prime Minister Charles Michel by late on Monday to confirm if the deal is on.