The National Audit Office said the Home Office had not made an up-to-date estimate of Britain’s illegal population since 2005.
The Home Secretary said she was working with French government and those who accuse her of inaction "don't know what they're talking about".
It comes as the number of migrants intercepted by authorities in the English Channel and brought to Dover during lockdown reached 1,000.
Shadow home secretary Nick Thomas-Symonds said the new legislation makes overseas workers feel unwelcome and risks a shortage of NHS staff.
Mr Farage said he will continue to report on migrant boats coming to the UK, despite being accusing of breaking coronavirus lockdown rules.
Priti Patel has said lockdown road restrictions at the border is partly responsible for an increase in small boats crossings from France.
Brexit Party leader Nigel Farage has claimed that illegal migrants are arriving in the UK “above and beyond the official figures”.
Border Force officers were pictured fitting face masks to suspected migrants as they continue to tackle illegal crossings amid coronavirus.
The British Medical Association has urged the government to grant NHS staff who have come from abroad indefinite leave to remain in the UK.
Immigration from outside the EU has hit 379,000, the highest since records began in 1975, according to the Office for National Statistics.
The Home Secretary said this system will “do what it says on the tin”, end free movement and bring overall migration numbers down.
Colin Browning has faced ridicule after he complained that a 55-minute wait at passport control in Amsterdam was not what he voted for.
Ian Blackford has said the PM "doesn't have a clue", accusing him of rejecting plans for a separate Scottish visa "without consideration".
The Home Secretary has announced proposals for an new points-based immigration system during her key note speech that Conservative Party conference.
Boris Johnson has revealed plans allowing foreign students to stay in the UK for two years after graduation.
Thirty migrants attempted to enter the UK by crossing the English Channel in four small boats, including a kayak.
The Prime Minister announced plans for a fast-track visa pathway for foreign scientists in a bid to boost the UK’s research sector post-Brexit.
Tory MP Alok Sharma said he supported Boris Johnson's pledge to deliver an Australian-style points-based immigration system.
New guidelines to help firms employ more refugees are being issued in a bid to help them integrate in the UK and contribute to the economy.
Former universities minister Jo Johnson has claimed he will propose changes to the upcoming immigration bill to help increase revenue from international students.
Neil Anderson, Executive Director of Migration Watch UK has said that reports of illegal migrants attempting to cross the Channel in dinghies are a “small front-end of a significant wedge”.
The chief executive of the Joint Council for the Welfare of Immigrants has said that the Home Office doubling the charge for migrants using the NHS is “double taxation” because many immigrants are also paying tax.
Immigration expert David Wood has said that migrants have an “unrealistic expectation” of the UK and believe that the streets are “paved with gold”.
An immigration lawyer has claimed Sajid Javid branding the Channel migrant crossings as a "major incident" is an exaggeration.
Six Iranian men have been found on a Kent beach, amid mounting calls for the Government to tackle the migrant crisis.
Home Secretary Sajid Javid is cutting short a Christmas break to return to the UK to tackle a wave of attempts by migrants to cross the English Channel by boat.
The Home Secretary has declared the rising number of migrants attempting to cross the English Channel a "major incident".
Four men have been detained under the Immigration Act after police boarded a cargo ship amid reports of stowaways threatening crew.
The Government will get immigration down to "sustainable" levels, but there will be no "specific target" for reducing the numbers, Home Secretary Sajid Javid has said.
A boat with nine suspect migrants on board has been picked up by the Coastguard in the third similar incident at Dover in two days.
The vice chair of Migration Watch UK has said the Home Office should be "put in the dock" for losing track of 450 foreign criminals in the last two and a half years.
Conservative MP David Davies has said the problem of adult refugee ‘students’ is going to be fairly common because they have a “vested interest” in pretending to be young.
Amnesty UK's refugee and migrant rights programme director has said the Home Office illegally taking DNA samples from immigrants has resulted in people "entitled to be here treated as if they're not".
The Director of the Joint Council for the Welfare of Immigrants has said that the Home Office has created a “hostile environment” after Sajid Javid apologised for immigrants being forced to provide DNA samples as part of their applications.
The Australian government is considering banning some immigrants from settling in big cities.
Immigration minister, Caroline Nokes, has refused to say whether she thought the Prime Minister was right in not apologising for the hostile environment policy.
The report suggests migration is not a "major determinate" of the wages of UK-born workers.
Researchers suggested that people who emigrate tend to be more aspirational and take risks, and pass their "grit and determination" on to their children
First lady Melania Trump has waded into the emotional controversy over policies enacted by her husband's administration that have increased the number of migrant children being separated from their parents.
The Environment Secretary also said Brexit has 'strengthened unionism'.
More than 6,000 visa applications for highly skilled workers like scientists, IT specialists and doctors with job offers in the UK were refused because of a Government-imposed cap on numbers, it has been revealed.
'A very contested piece of legislation across government departments', says peer
'The idea that we’re talking about deporting people who came here as children 60 years ago is amazing,' says Robert Winder
'some of the ways they have been treated has been wrong, and I am sorry,' said Mrs May
UK-based refugees are most likely to remain and contribute to their host economy and are "much better supported" compared to those elsewhere
talkRADIO hosts says it's a nonsense that we're paying for immigrants to learn the language
The money will pay for fencing, CCTV and detection technology in Calais and other ports
Ukip leader Henry Bolton has split from model Jo Marney after her comments on Meghan Markle
Donald Trump retweeted Jayda Fransen's tweets in a move described by Theresa May as 'wrong'
Sebastian Kurz says the People's Party and the Freedom Party have similar plans on tax and immigration
Politicians from the Alternative for Germany party will attend the first sitting of the recently elected parliament in the country on Wednesday
The Freedom Party is against immigration and it has allegedly been linked with Nazis
The Government has improved on its first announcement of a one year grace period