"At a time when we are trying to build our relationship with the Commonwealth post-Brexit for trade and other reasons, it is extremely damaging what has been revealed about the way Commonwealth citizens have been treated", said Labour MP Diane Abbott, the UK's shadow home secretary.
He replaced Amber Rudd, who resigned on Sunday night following a crisis over the threatened deportation of members of the Windrush generation, whose families moved to Britain from the Caribbean in the 1950s and 1960s.
He was instructing the press office to brief people like me that "there are no removal targets for immigration enforcement officers, regional or national".
Speaking during a local elections campaign visit in Manchester, Mrs May said in a TV interview: "When I was Home Secretary, yes, there were targets in terms of removing people from the country, who were here illegally".
It is believed that Rudd chose to fall on her sword rather than face more humiliation amid the outcry over the Windrush immigration debacle, and telephoned Theresa May to inform her of the move late on Sunday.
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Javid is a former banker whose father was a bus driver.
"These deportations are going to keep happening, because the way the law is framed at the moment is by defining the Windrush generation exclusively by the Immigration Act of 1971, which is an explicitly racist piece of legislation meant to stop coloured people coming into the United Kingdom..."
Rudd, who had faced growing pressure over the so-called Windrush scandal, told lawmakers last week that there were no targets for the removal of people deemed to be in the country illegally.
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Security researcher Jackie Stokes reported the issue to Facebook. "Everyone deserves to feel safe, even on the internet".
"If you look at what we're doing as a government, and have been doing over the years as a government, what we are doing is responding to the need that people see for a government to deal with illegal immigration", she said.
Mr Javid has also declared plans to put his "own stamp" on the Home Office.
In a series of weekend Twitter messages, Rudd said she was unaware of the memo but admitted she should have known of the targets.
The furor has grown since The Guardian reported that some people who came to the United Kingdom from the Caribbean in the decades after World War II had recently been refused medical care in Britain or threatened with deportation because they could not produce paperwork proving their right to reside in the country.
Immigration is a divisive issue in Britain, and reducing the number of newcomers was a major factor for many voters who in 2016 backed leaving the European Union.
Outrage over the plight of the migrants - some of whom lost jobs and fell into debt as they struggled to prove their status - led to a personal apology from Mrs May, now Prime Minister, to Caribbean leaders at the Commonwealth summit in London last month.
"Amber Rudd has been a human shield for Theresa May - and now she has gone".
Johnson said he was "really sad" to lose her from the Cabinet.