Israel’s acting foreign minister should apologise to Poland for accusing the country of being antisemitic, the US ambassador to Warsaw has said.

Georgette Mosbacher’s advice came after an escalating diplomatic row between Israel and Poland saw a key summit in Jerusalem cancelled.

On Wednesday, she said the partnership between the two countries was too important for the wider region to be damaged by “rhetoric”.

Just days ago, the US held a major conference in Warsaw on Middle East security in an attempt to cobble together support for Washington’s attempts to isolate Iran. But the spat between Poland and Israel threatens to overshadow and undo the US manoeuvring.

Ms Mosbacher had earlier written on her Polish-language Twitter account that comments by Israel Katz, Israel’s acting foreign minister, were “offensive” and out of place.

She said: “I just felt that two strong allies like Israel and Poland, of course they are strong allies of the United States, shouldn’t be using that kind of rhetoric.”

“We are too important to each other not to work these things out,” she added.

Remembering the Holocaust Show all 16 1 /16 Remembering the Holocaust Remembering the Holocaust 80,000 shoes line a display case in Auschwitz I. The shoes of those who had been sent to their deaths were transported back to Germany for use of the Third Reich Hannah Bills Remembering the Holocaust Barracks for prisoners in the vast Auschwitz II (Birkenau) camp. Here slept as many as four per bunk, translating to around one thousand people per barracks. The barracks were never heated in winter, so the living space of inmates would have been the same temperature as outside. Hannah Bills Remembering the Holocaust Hannah Bills Remembering the Holocaust Sign for the Auschwitz Museum on the snowy streets of Oswiecim, Poland Hannah Bills Remembering the Holocaust The Gateway to hell: The Nazi proclamation that work will set you free, displayed on the entrance gate of Auschwitz I Hannah Bills Remembering the Holocaust A disused watchtower, surveying a stark tree-lined street through Auschwitz I concentration camp Hannah Bills Remembering the Holocaust Stolen property of the Jews: Numerous spectacles, removed from the possession of their owners when they were selected to die in the gas chambers of Auschwitz Hannah Bills Remembering the Holocaust A sign bearing a skull and crossbones barks an order to a person to stop beside the once-electrified fences which reinforced the Auschwitz I camp Hannah Bills Remembering the Holocaust The peace and the evil: Flower tributes line a section of wall which was used for individual and group executions Hannah Bills Remembering the Holocaust Life behind bars: Nazi traps set to hold the Third Reich’s ‘enemies’. In Auschwitz’s years of operation, there were around three hundred successful escapes. A common punishment for an escape attempt was death by starvation Hannah Bills Remembering the Holocaust Burying the evidence: Remains of one of the several Auschwitz-Birkenau gas chambers Hannah Bills Remembering the Holocaust Hannah Bills Remembering the Holocaust The three-way railway track at the entrance to Auschwitz-Birkenau camp. This was the first sight the new camp arrivals saw upon completion of their journey. Just beside the tracks, husbands and wives, sons and daughters and brothers and sisters were torn from each other. Most never saw their relatives again Hannah Bills Remembering the Holocaust A group of visitors move through the Auschwitz-Birkenau camp. Viewed from the main entrance watchtower of Auschwitz-Birkenau Hannah Bills Remembering the Holocaust "The Final Solution": The scale of the extermination efforts of the Nazis at Auschwitz-Birkenau can be seen by comparing the scale of the two figures at the far left of the image to the size of the figure to the left of the railway tracks' three point split Hannah Bills Remembering the Holocaust Each cattle car would transport up to one hundred people, who could come from all over Europe, sometimes from as far away as Norway or Greece. Typically, people would have been loaded onto the trucks with around three days food supply. The journey to Auschwitz could sometimes take three weeks. Hannah Bills

Mr Katz, Israel’s top diplomat, had sparked fury among Poles when he told local news outlet i24 on Monday that as a son of Holocaust survivors he would never “forgive and never forget … there were many Poles who collaborated with the Nazis”.

He went on to quote former Israeli prime minister Yitzhak Shamir, saying: “Every Pole suckled antisemitism with his mother’s milk.”

His comments followed controversial remarks made by Israeli’s prime minister Benjamin Netanyahu during a recent visit to Warsaw where he was quoted as saying “the Poles collaborated with the Nazis”.

Mr Netanyahu’s office said later that he was misquoted and had not implicated all Poles or the Polish nation in the Holocaust.

But Poland was outraged by the comments. Commentator Boguslaw Chrabota likened Mr Katz’s remarks to the equivalent of an “atomic bomb” and “hate speech”, in an opinion piece in the centre-right newspaper Rzeczpospolita.

Polish officials risked the wrath of both trading partner Tehran and its close EU partners by hosting the anti-Iran summit, and viewed Mr Netanyahu’s commentary on Polish soil as incendiary, insulting, and ungrateful.

The Israeli statements triggered Poland to pull out of the “Visegrad summit” of central European leaders, which was due to be hosted in Jerusalem this week. The collapse of the talks dealt a damning blow to the Israeli leader, who is looking to shore up support abroad ahead of elections in early April.

Mr Netanyahu was due to meet the leaders of Poland, Hungary, the Czech Republic and Slovakia in the first meeting of the so-called V4 group to be held outside of Europe. Instead, he held bilateral meetings with the leaders of Hungary, the Czech Republic and Slovakia.

Israeli prime minister Benjamin Netanyahu at a press conference of Visegrad leaders in Budapest in 2017 (AFP/Getty)

Mateusz Morawiecki, the Polish prime minister, said the Israeli remarks were “racist and unacceptable”, adding: “This is not something that can be left without a response.”

He later downgraded its participation in the meetings, saying he would send his country’s foreign minister.

Relations worsened on Tuesday when Polish deputy foreign minister Szymon Szynkowski vel Sek said that Warsaw was still waiting for Israel’s government to apologise for the “shameful, scandalous and slanderous” statements, which require an “unequivocal and definite” reaction.

Mr Szynkowski vel Sek added that it was up to Israel to choose the form the apology takes and how it is delivered, adding that more education was needed about what happened during the Second World War on Polish soil.

The cancelling of the summit came at a terrible time for Mr Netanyahu who is losing popularity in the polls ahead of the election as he battles possible indictment on corruption charges.

Mr Netanyahu, who come July will be Israel’s longest serving premier, had been favourite to win after a string of political successes last year. The first was Donald Trump’s decision to move the US embassy in Israel from Tel Aviv to Jerusalem, thereby recognising the contested city as Israel’s capital.

The US embassy in Israel was moved to Jerusalem in December 2017 (Reuters)

Mr Trump later slashed funding to the UN agency for Palestinian refugees, a move which was welcomed in Israel and added to Mr Netanyahu’s popularity.

On Tuesday, a US official announced that its consulate general in Jerusalem, which serves Palestinians, will be absorbed into the new US embassy to Israel between in March. The merger was condemned by Palestinians, who see it as another blow to their chance of building a nation with parts of Jerusalem as their capital.

Secretary of state Mike Pompeo announced the decision to create a single diplomatic mission last October but failed to give a date.