The cancelling of oath ceremonies is just one part of the Trump administration’s latest efforts to tighten immigration rules. Migrants from the 19 countries already subject to a travel ban have had their immigration processing halted no matter where they are in the process, not just those at the final step.

The move, and others like it, came in the days after an Afghan national opened fire on National Guard members in Washington DC on 26 November, killing one and critically injuring another. The Trump administration has used the shooting as justification for a number of new efforts to tamp down immigration, including sending an additional 500 National Guard troops to DC, reducing the work visa validity period from five years to 18 months, and pausing all asylum claim decisions.

US Citizenship and Immigration Services has said the restrictions are necessary to safeguard national security, protect American lives, and ensure public safety.

But Mario Bruzzone, vice president of policy at the New York Immigration Coalition, a nonprofit that represents hundreds of immigrant rights groups, said the restrictions put immigrants who are in need of protection in dangerous situations.

“An indefinite pause is a ban, plain and simple, and they’re using the recent shooting in DC as a pretext for an escalation in attacks on immigrants and refugees,” Mr Bruzzone told the BBC.

One Venezuelan immigrant, Jorge, was also on the cusp of becoming a US citizen when suddenly, less than 24 hours before his ceremony on 2 December, he was told it had been cancelled without explanation.

“I had everything prepared, including attending the ceremony with my son. To have it cancelled the day before, without any clear reason, left us with no clarity about the next steps,” Jorge said.

Jorge, which is not his real name, has asked to remain anonymous, but his identity and experience have been verified by the BBC. He said he obtained permanent residency in 2017 through the “extraordinary ability” category, which is reserved for professionals at the top of their field.

Jorge agrees with the Trump administration that there should be “stricter reviews” of immigrants, he told the BBC. He blames the Biden administration for allowing too many immigrants into the country, and added that if he had been able to vote, he would have supported President Donald Trump.

What concerns him, he said, is that long-term residents with no criminal history are now being “generalised” alongside people who he believes do require deeper scrutiny.

“I just want those of us who have followed every rule to be able to move forward with our cases — and for those who have committed fraud or crimes to face the appropriate legal consequences,” Jorge said.