Millions of workers aren't getting any help from the largest emergency aid deal in US history.

When stimulus checks start going out across the country, undocumented immigrants won't be receiving them.

That's not a surprise. They aren't eligible for most federal benefits.

But immigrant rights advocates say leaving this group out of the $2 trillion plan isn't merely a matter of dollars and cents, and it isn't something that only affects undocumented workers and their families. It's a dangerous decision, they argue, that puts the whole country's health at risk as the novel coronavirus spreads.

Critics counter that it's not the US government's place to bankroll someone who broke the law, and that as unemployment skyrockets, American workers should come first.

This isn't just another set of salvos in the political battle over immigration that's raged in our country for decades. It's a very different debate -- because of who could be impacted, and what's at stake.

Even though Congress has cast its votes on the stimulus bill, the debate is far from over, and the impact of what's happened so far is only just coming to light. Here's a look at why this issue matters, and what could happen next.

The argument: 'Everyone has an immigrant neighbor'

Unauthorized workers make up about 5% of the US labor force -- around 7.6 million people, according to the latest estimates from the Pew Research Center.

Advocates argue the coronavirus crisis that's devastated global markets, overwhelmed hospitals and left millions without jobs is having an outsized impact on undocumented workers. Many had service-sector jobs that were decimated by the pandemic. Those who remain employed largely don't have the option of working from home, and are risking their safety to keep supply chains going.

"It's undocumented workers that are still in the fields, still in the factories, still the janitors in the buildings, still looking for work as day laborers," says S.G. Sarmiento, campaign director for the National Day Laborer Organizing Network.

At first glance, you wouldn't necessarily expect this group to be included in the stimulus deal. After all, they generally aren't eligible for government benefits. And these days it's rare to see leaders in Washington rolling out the welcome mat for immigrants.

But because of the threat the novel coronavirus poses, advocates argue this shouldn't be treated as business as usual. In a public health crisis, they say, if someone feels like they can't miss work or can't afford medical care, that impacts the entire community.

"From a public health perspective, you cannot have an effective national response to a pandemic that excludes enormous segments of the population. That's both illogical and immoral," Sarmiento says. Read more at CNN