"We will not find a new Withdrawal Agreement within 30 days that will be very different from the existing one", he said as he spoke alongside the Prime Minister at Elysee Palace.
"I think we can get a deal and a good deal".
They were both prepared to give as good as they got.
Mr Johnson has called for it to be scrapped - a "backstop-ectomy" as he put it - because he claims the measure would, potentially indefinitely, leave the United Kingdom trapped in a customs union with the EU and result in Northern Ireland being bound by single market rules over which it has no influence. "Better said, one must say that one can also achieve it by October 31", Merkel told a news conference in the Hague.
"The point can't be to exit Europe and say "we'll be stronger", before in the end, becoming the junior partner of the United States, which are acting more and more hegemonically".
German Chancellor Angela Merkel raised the possibility that a negotiated departure for Britain from the European Union might still be possible even as the clock is ticking on a deal that would satisfy both sides.
"One should say it can be done by October 31", Merkel said on Thursday.
The head of DW's Brussels bureau, Max Hofmann, suggested that Johnson feels emboldened by Merkel's 30-day leeway to resolve the Irish backstop issue and ramp up pressure on Brussels.
Macron was hosting Johnson in Paris on Thursday ahead of this weekend's G7 summit in Biarritz, a resort town in France's south.
The Paris visit was the second leg of Johnson's first foreign trip as prime minister.
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"We must help the British deal with this internal democratic crisis, but we mustn't be hostage to it nor export it", Macron told reporters on Wednesday, referring to the British government's struggle to honour the result of the 2016 referendum in which the country voted to leave the EU.
Like German Chancellor Angela Merkel on Wednesday, Macron supported allowing another 30 days to find a solution to the vexed issue of the Irish border which has bedevilled negotiations since 2017.
The backstop provided "indispensable guarantees to preserve stability in Ireland and the integrity of the single market", Macron said. The EU has ruled out renegotiating the Brexit agreement hammered out with Britain past year.
Yet Johnson appeared emboldened Wednesday as he and Merkel faced reporters before holding talks over dinner - where tuna tartare, saddle of venison and chocolate tarte were on the menu.
Downing Street and Brussels remain in a stand-off with 70 days to go until Britain is due to leave the EU.
Macron also reiterated what the European Union has been saying for months - that it won't re-open the Brexit divorce deal negotiated with Britain's previous prime minister, Theresa May.
"Obviously we also think of the many citizens, British citizens living now in other countries of the European Union who also have to deal with the situation should Britain, from one day to the next, no longer be a member of the European Union".
Officially, the European Commission has refused to say if Dublin's plans to carry out checks away from the Border would satisfy its EU obligations.