Labour has condemned the government for praising Donald Trump’s vision for Middle East peace, with the shadow foreign secretary, Emily Thornberry, calling it a “shameful betrayal” of previous UK support for a viable two-state solution.

Trump’s plan grants Israel the bulk of its wishes and offers a Palestinian state under severe restrictions. In an urgent Commons question, Thornberry called it a “monstrosity” and said it guaranteed future violence.

Responding for the government, the junior Foreign Office minister Andrew Murrison accepted that the UK’s vision of a two-state solution was different, but said the US proposals should be welcomed as a possible route towards restarting peace talks.

Murrison accused Thornberry of not fully understanding the 181-page document, which he said he had studied in full. “I don’t know whether she’s done more than just skim through it and read the remarks of her researchers,” he said.

Trump unveiled the plan at the White House on Tuesday alongside the Israeli prime minister, Benjamin Netanyahu. Palestinian leaders did not attend, saying the proposals were unfair. At prime minister’s questions on Wednesday, Boris Johnson praised the plan, saying it “has the merits of a two-state solution”.

Murrison told MPs that the US’s ideas deserved “genuine and fair consideration”, while stressing that the UK position was still very different.

“Our view remains that the best way to agree peace is through substantive peace talks between the parties leading to a safe and secure Israel living alongside a viable and sovereign Palestinian state based on 1967 borders with agreed land swaps, Jerusalem as the shared capital of both states, and a just, fair, agreed and realistic settlement for refugees,” he said.

Thornberry condemned the document and its backers. “Trump and Netanyahu – two corrupt, racist, power-crazed leaders coming together not in the interests of peace, not to promote a two-state solution, not to end violence in the Middle East, but simply to further their chances of re-election by doing the opposite.”

She said the plan “destroys any prospect of an independent, contiguous Palestinian state. It legitimises the illegal annexation of Palestinian land for settlers. It puts the whole of Jerusalem under Israeli control. It removes the democratic rights of Palestinians living in Israel, and removes the right of Palestinian refugees to return to their land.

“This is not a peace plan, it is a monstrosity, and a guarantee that the next generation of Palestinian and Israeli children, like so many generations before them, will grow up knowing nothing but fear, violence and division.”

She added: “Why on earth are our prime minister and our foreign secretary just going along with this sham of a peace deal by actively welcoming it and saying Palestine should get behind it?”

Murrison noted that other nations, including some Arab countries, had called for the proposal to be looked at, and said the UK was thus “right in the mainstream of international opinion on this document”.

He said: “At the moment we have a vacuum where there is no negotiation. What we would want to see is a return to negotiation, and at the moment we need something that will get us going in that respect. And if this plan, with all its faults and foibles, which every plan has, enables us to get round the table again, that has to be a good thing.”