One EU source told The Guardian, a British newspaper, that there had been "a two-and-a-half-year negotiating process in which the EU [already] compromised, including on the question of the backstop".
The European Council president, who posted a photo of himself relaxing in a hammock, said opposing the contingency plan amounted to support for the return of a hard border.
But Macron said a no-deal Brexit would be of Britain's own making, adding that any trade deal London cut with Washington would not mitigate the cost of crashing out of the bloc.
Much faith has been placed in getting a free trade deal with the United States to replace the EU.
The British Prime Minister Boris Johnson in fact rejects a hard border between Ireland and Northern Ireland with his rejection of the so-called backstop.
Farage also said that he fears that a new Withdrawal Agreement mark two will arise out of the ashes of the old one but still be 99% identical.
The French official cited earlier said that a no-deal Brexit would not remove Britain's obligation to pay its exit bill to the EU.
Mujtaba Rahman, an analyst with Eurasia Group, tweeted that Johnson's opening gambit was "very vague & won't fly with the European Union", adding that the British leader appeared to be "playing the blame game".
The UK does not want any border - effective or virtual - between Britain and Northern Ireland.
Trump Says White House Considering Cutting Payroll Tax, Rejects Recession Fears
Consumer confidence has dropped 6.4 per cent since July. Lowest unemployment ever within nearly all categories. That's up from 25 per cent in the February survey.
Britain wants to do a swift Brexit deal but the "undemocratic" Irish border backstop must be axed in full to prevent a no-deal exit, Prime Minister Boris Johnson told German Chancellor Angela Merkel on Wednesday.
London insisted there was "no prospect" of a Brexit deal unless the backstop was abandoned, after Brussels said Britain had still not come up with a workable alternative.
"But if we can do that [remove the backstop], then I'm absolutely certain that we can move forward together."
Boris Johnson is to meet Emmanuel Macron later, hours after the French president seemed to downplay hopes of solving the Irish backstop problem.
The British Prime Minister's first official proposal to the European Union since taking office last month has been met with responses ranging from indifference to incredulity in the German capital, with senior officials saying it showed Westminster's debate on the withdrawal agreement to be stuck on the same arguments of the so-called Brady amendment, which the European Union rejected in January.
"Boris should not attempt to corral his fellow heads of government into a common line on every issue, nor set himself up as the go-between for the United States and Europe", former British foreign minister William Hague wrote in the Telegraph newspaper.
The minister managing "no-deal" preparations, Michael Gove, challenged the documents' catastrophic predictions, saying they set out a "worst-case scenario" and plans for Brexit have been accelerated since Johnson's installment.
Boris Johnson is meeting Angela Merkel on Wednesday in what appears to be more of a quest for assigning responsibility for the failure to reach a new consensus on Brexit rather than substantial negotiations. "They're trying to make us sweat at the moment and to be honest, I don't think we should be sweating", he said.
The study warns of fuel, food and medicine shortages and a "three-month meltdown at [British] ports", the newspaper reports.
Johnson is to take part in the G7 Summit in Paris on Saturday, with the participation of US President Donald Trump, perhaps the biggest public supporter of a no-deal Brexit.