People from a total of 27 nations participate in a Naturalisation Ceremony in Brooklyn on June 14, 2019 in New York City. File/ TNS

Matt Pearce, Tribune News Service

This is where a nation changes: a public school auditorium that moonlights as a veritable citizenship factory. At the M.O. Campbell Educational Center, where murals honouring the arts and sciences adorn the walls, US immigration officials routinely hold packed naturalization ceremonies. Immigrants approved for citizenship walk in, take the oath of allegiance, and walk out as Americans — and as a small army of new voters.

“It will never, ever be easier to register than it is this morning,” US District Judge Keith P. Ellison, who presided over a ceremony last month, told the 2,155 immigrants from more than 100 countries who had just taken their citizenship oaths. “The record for registrations is 89% of those who are sworn in. ... Let’s see if we can break that record today.”

Amish Soni, a 34-year-old radiologist from India holding a small American flag, was one of the 85% who registered to vote that morning, aided by a volunteer from the League of Women Voters. He “definitely” plans to vote in 2020, partly because he thinks the health care system should be fixed, but also: “I’m not a big fan of Donald Trump.” And he’s far from the only one.

At ceremonies like these across the country, hundreds of thousands of immigrants are expected to receive their US citizenship and become eligible to vote before November 2020, gently reshaping — and threatening — the electoral path that President Donald Trump must thread to win reelection.

Over the last two decades, naturalised immigrants have grown into a force at the ballot box, with the United States recently swearing in more than 700,000 foreign-born US citizens each year.

Naturalized citizens — who share the full legal rights of natural-born citizens, except for the ability to become president — cast more than 8% of the ballots in the 2018 midterm elections, almost double their share in the 1996 presidential contest, according to US Census Bureau estimates.

Surveys show that many of the new citizens are liberal-leaning, which is one of several demographic trends helping put some historically red states such as Texas, Arizona and Georgia closer to Democrats’ reach.

The gains in immigrants’ electoral strength have been gradual. But Trump’s anti-immigration policies may be accelerating the trend by spurring even more people to naturalize and to vote, worrying some moderate Republican experts.

“It’s not ‘bad-ish’ news. It’s extremely bad,” said Mike Madrid, a Sacramento-based GOP consultant who studies Latino voters. He thinks the party’s use of anti-immigrant rhetoric to mobilize non-college-educated white voters will come at a steep electoral price. “This is a five-alarm fire.”

Some experts said the national climate reminded them of California in the mid-1990s, when heightened rhetoric against immigrants and the Proposition 187 ballot measure to prohibit services for some immigrants inspired a wave of eligible Latino immigrants to naturalize and register to vote.

It helped transform the home of Ronald Reagan and Richard Nixon into a nearly impenetrable Democratic stronghold. “Republicans did not learn their lesson, and they have revived some of that anti-Latino sentiment,” said Democratic US Rep. Norma Torres, who was born in Guatemala and naturalised in 1996 so she could get more involved in politics.

The Trump campaign disagrees. “Democrats make a mistake when they assume that all immigrants think the same way,” said campaign spokesman Tim Murtaugh. “Our own data shows that a great many legal immigrants agree with President Trump’s position on enforcing immigration laws, because they feel that if their families played by the rules, then other people ought to as well.”

Murtaugh declined to share the data, but he said the numbers are why Trump made a recent visit to New Mexico — a state he lost to Hillary Clinton by more than 8 percentage points — to court Latino voters.

Citizenship applications spiked in the two years before the 2016 election, which is common before a presidential contest. But instead of dropping as usual afterward, the number of filings grew in 2017 in the wake of Trump’s victory. The more than 800,000 citizenship requests in 2018 were also the most filed in a midterm election year in two decades.

According to data collected by the New Americans Campaign, a coalition of nonprofits, almost a third of US immigrants hoping to naturalise this year were most interested in gaining the power to vote — the “top reason by far,” said Melissa Rodgers, the director of programs at the Immigrant Legal Resource Center, which runs the coalition.

Filing an application does not necessarily lead to naturalisation; the denial rate is usually about 1 in 10. Immigrant advocacy groups have complained that the Trump administration has allowed a backlog to pile up, putting some applicants at risk of missing the 2020 election.

Latino and Asian immigrants are particularly potent additions to the electorate, with turnout rates that are often 5 to 8 percentage points higher than their natural-born counterparts, according to Census estimates.

A September survey by Univision, conducted by the research firm Latino Decisions, said 81% of naturalised Latino respondents disapproved of the job Trump was doing as president; 12% said they were committed to voting for Trump in the 2020 election, and 64% said they plan to vote for the eventual Democratic nominee.

“A lot of folks are responding to the climate of fear and division and general intimidation against immigrant and refugee communities,” said Diego Iniguez-Lopez, the policy and campaigns manager at National Partnership for New Americans, a coalition of immigrant advocacy groups. This year, the coalition launched a campaign to try to naturalize 1 million new citizens in time for the 2020 election. Trump has been less unpopular with naturalised Asian immigrants, with a 38% approval and 52% disapproval rating, according to a 2018 survey by Asian and Pacific Islander American and AAPI Data. These voters reported supporting Hillary Clinton over Trump by 48% to 28%.

In recent decades, Asian Americans as a whole — the fastest-growing ethnicity in the country — had been generally more open to supporting Republicans. But the diverse group is increasingly becoming a reliably Democratic demographic, according to Karthick Ramakrishnan, a professor of public policy at the University of California, Riverside who studies Asian American voting trends.

“What we’ve seen in the last two election cycles is either a crystallization or solidification in voting preferences and increasingly party preferences as well,” Ramakrishnan said.

Liking a party is one thing. Mobilizing to vote is another. Roughly three-fifths of foreign-born Asian American voters surveyed by APIAVote and AAPI Data said they were not contacted by the Democratic Party or the GOP before the 2018 election.