Suella Braverman was accused of being in "complete denial" after she claimed on Sunday it was unfair to say the huge hold-ups at Dover were "an adverse effect of Brexit".
Despite recurring problems with gridlock in Kent in 2021 and 2022, the home secretary claimed checks were "operating very smoothly at the border" - blaming current woes on bad weather and it being "a very busy time of year".
But Mr Sunak's official spokesperson said "a combination of factors" were to blame, including new passport control processes, poor weather and the high volume of traffic at Easter.
Asked about the role of post-Brexit checks, the spokesperson acknowledged that French officials are now required to inspect and stamp every passport as passengers leave the UK.
"Obviously we recognise there are new processes in place," they said on the manual checks.
"That's why authorities were given a long time to prepare for the new checks including during the transition period, of course, and we are in discussion with our French counterparts about how we can further improve the flow of traffic."
The No 10 officials said the government was "working with our French counterparts in increasing our ability to move traffic and passengers through freely".
Diese Geschichte stammt aus der April 04, 2023-Ausgabe von The Independent.
Starten Sie Ihre 7-tägige kostenlose Testversion von Magzter GOLD, um auf Tausende kuratierte Premium-Storys sowie über 8.000 Zeitschriften und Zeitungen zuzugreifen.
Bereits Abonnent ? Anmelden
Diese Geschichte stammt aus der April 04, 2023-Ausgabe von The Independent.
Starten Sie Ihre 7-tägige kostenlose Testversion von Magzter GOLD, um auf Tausende kuratierte Premium-Storys sowie über 8.000 Zeitschriften und Zeitungen zuzugreifen.
Bereits Abonnent? Anmelden
Let e-scooters on our roads? As a cyclist, I'm all for it...
Transport secretary Louise Haigh is preparing to announce a plan to legalise electric scooters on Britain’s roads, as part of her wider integrated transport strategy.
Grandad vs YouTuber: is the Tyson-Paul fight for real?
Critics scream 'fix' ahead of tonight's big bout in Dallas
'Des was the gold standard'
A contender for the 'Match of the Day' job, Kelly Cates of Sky Sports tells Ross Heppenstall she's not looking to move but if the BBC calls there's one ex-host she'd love to emulate
Watkins gamble pays off to leave tricky Kane question
In the tale of the captain and the caretaker, Lee Carsley’s great gamble paid off.
Why I'm not mega excited about Reeves's pension play
The chancellor aims to free £80bn of investment by pooling funds. But are savers being overlooked in pursuit of growth?
Could Zelensky go nuclear if Trump cuts US support?
Two years ago, as the Russian army was retreating back from northeast Ukraine, there were serious worries that Vladimir Putin would use tactical nuclear weapons to block the Ukrainian advance.
Israel's forced displacement of Palestinians a 'war crime'
Israeli forces have committed war crimes and crimes against humanity in Gaza through a \"systematic\" campaign of \"massive deliberate forced displacement\" of Palestinians, Human Rights Watch (HRW) has said.
Fears for climate pledges as Argentina leaves Cop29
Right-wing leader orders delegation to quit Baku summit
Thousands in Spain unable to return home as deluge brings fresh risk of floods
Thousands of Spaniards evacuated ahead of a fresh deluge of rain have been told not to return home as swollen riverbanks threaten to overflow.
House pariah status landed.Gaetz attorney general nod
President-elect Donald Trump has lined up former Florida congressman Matt Gaetz to be his next attorney general.