Britain is due to leave the bloc on March 29, and the government doesn't have an approved agreement on the rules and conditions that will replace the 45 years of frictionless trade that came with being an European Union member.
Mr Jacob Rees-Mogg, a Conservative lawmaker and keen supporter of Brexit, told the Mail on Sunday that he believed the plans showed unnecessary panic by officials over a no-deal Brexit, as senior royals had remained in London during World War II bombing.
Addressing King Willem-Alexander, the 92-year-old said: "I recall the state visit of your grandmother Queen Juliana and Prince Bernhard in 1972, when I spoke of how our nations' close understanding and relationship would become increasingly important as a new configuration of Europe was emerging". Prime minister Theresa May appointed Brexiteers Steve Baker, Owen Patterson and Marcus Fysh as well as Remainer former ministers Damian Green and Nicky Morgan to the group.
Theresa May is due to meet European Commission president Jean-Claude Juncker in Brussels on Thursday. "But, of course, there is room, if used intelligently, there is room enough to give further clarifications and further interpretations".
"The worst-case scenario is no deal Brexit and in our opinion we should do what we can to avoid that, to look for some solutions, to be creative", he told reporters in Brussels on Monday.
Attorney General Geoffrey Cox last week attempted to originate a "Plan D" Brexit deal in which leading Eurosceptics would form a "joint interpretive instrument" guaranteeing a time-limited backstop.
Labour MP Virendra Sharma, a supporter of the pro-EU Best for Britain campaign, said: 'Surely this is peak Chris Grayling, only this time he's gone worldwide.
As the prime minister came to the end of her speech she started taking questions from members of the Northern Ireland media.
He added that the Good Friday agreement can not be used as a bargaining chip while Brexit advocates search for an alternative arrangement. She told an audience in Belfast that her commitment to avoiding such an arrangement was "unshakeable".
She infuriated Tory Eurosceptics by saying she is not proposing to scrap the backstop from the Brexit deal altogether - despite previously acknowledging it must be replaced with "alternative arrangements".
May is in Northern Ireland to reassure communities that she can deliver an orderly Brexit that will ensure peace in a province riven by three decades of sectarian conflict until a 1998 accord.
Merkel's stance on Brexit is driven by an eagerness to preserve the integrity of the European Union and its internal market, which are crucial to Germany's post-war identity and prosperity, while also keeping Britain close to the bloc even after it leaves.
DUP leader Arlene Foster told BBC on Tuesday that "the current backstop" was toxic "to those of us living in Northern Ireland, and indeed for unionists right across the United Kingdom, because it would cause the break-up of the United Kingdom into the medium and longer term".