"Where some of its most senior people who hold the greatest offices of state, at every twist and turn, when our Prime Minister moves towards securing a Brexit that will serve everybody in our country, the softest, most sensible Brexit, both publicly and privately they undermine her and scupper her attempts".
Solicitor General Robert Buckland intervened four times during a speech by the former Attorney General Dominic Grieve, whose amendment would effectively give MPs a veto on the government's negotiating agenda if a deal isn't done by the end of November.
The EU Withdrawal Bill will head back to the House of Commons this week for a two-day debate by MPs.
Davis agreed to remain in place after receiving a guarantee the arrangement would last just a year and held a short meeting with EU Brexit chief Michel Barnier in Brussels today.
The government's eleventh hour amendment, lifted in large parts from Tory Remainer Dominic Grieve's own proposal and to be presented to the Lords on Monday, is expected to give MPs the right to veto the government's strategy if it fails to secure a political agreement with the European Union by 30 November.
It's not clear what backing, if any, Grieve has for his compromise bid.
The rebels said on Tuesday they were told the promise made by the prime minister was "a matter of trust".
She added she was sure Mrs May "will honour her word".
"We have now removed every incentive from the European Union for doing a deal by the end of November", one senior United Kingdom government official said. But there is going to be no binary choice of the deal on the table or no deal, with Parliament bypassed.
Downing Street insisted the key part of the Grieve amendment - to force Mrs May to "follow any direction" voted on by MPs if no deal by February - was not on the table.
The government was putting a combative spin on the concessions Tuesday evening: "The Brexit Secretary has set out three tests that any new amendment has to meet - not undermining the negotiations, not changing the constitutional role of Parliament and Government in negotiating worldwide treaties, and respecting the referendum result", a spokesperson for the Brexit department said in a statement.
"I don't think that's right", she said.
Remainers see it as a road map to ensuring Britain leaves with a good deal.
Labour and Conservative MPs are bitterly split over Prime Minister Theresa May's desire to keep Britain in the European Economic Area.
There are mutterings from Brexiteers that a betrayal on this could be the moment they go over the top and withdraw their support from the prime minister; this is a showdown averted but not killed off.