"We will table formal written solutions when we are ready, not according to an artificial deadline, and when the European Union is clear that it will engage constructively on them as a replacement for the backstop".
He said: "I don't have an erotic relationship with the backstop, if the results are there I don't care".
Juncker remains convinced that Brexit will happen, and warned that such "catastrophic consequences" of a no-deal Brexit could easily reignite tensions between Ireland and Northern Ireland that ended back in 1998 after the Good Friday Agreement.
The time available to reach a Brexit deal is "shrinking rapidly", according to the Government.
UUP peer Lord Empey said that the Irish government should be working with London, as well as parties in Northern Ireland, to ensure that a hard border is avoided.
Under the rules of the EU's single market, goods and people can move across the 28 countries seamlessly.
"We have turbocharged preparations for Brexit across all sectors, including automotive, with 108 million pounds of funding to promote and support businesses", the government spokesman said.
In what Downing Street has billed as Johnson's setpiece Brexit speech in NY, on Tuesday morning he is to address United States and Canadian businesspeople in the city's plush and newly built Hudson Yards district. And they say Britain has not come up with proposals for maintaining an open border between European Union member Ireland and the U.K.'s Northern Ireland - the key sticking point in the dispute.
U.N. Climate Summit Sets Stage For New National Emissions Promises
Or, as someone said at Friday's rally on the Capitol steps: The world will go on, but we will not be able to live on it. "It is your generation that must hold us accountable to make sure we don't betray the future of humankind".
The Trump administration is also looking to agree a cut in the so-called Google tax on USA tech corporations as part of any trade deal.
RAF Voyager landed in NY on Sunday evening - the early hours of Monday UK time - carrying with it Mr Johnson and assorted members of the media.
He told Channel 4 News: "To give you another example, it may be that we want, for instance, to take advantage of tax freedoms to allow companies to invest more in capital and plant".
Asked by Channel 4 if Ireland could help the impasse by, for example, accepting some United Kingdom regulations, Johnson called for movement on all sides.
"Some will say we're not going far enough, others will say we're going too far, but that's politics".
"But I think we are getting a little bit ahead of ourselves".
Johnson arrived at the global gathering on Monday with a balancing act to effect.
The official added: "Obviously the prime minister will be able to talk through the ideas which we have for replacing the backstop, and if the leaders are asking the prime minister questions, I'm sure he'll be very happy to talk about what our thinking is".
The EU side worries London may be making the same mistake as those of former British premiers Theresa May and David Cameron grappling with Brexit.