Obviously, the big political news of the past couple of days has come from the Democratic side. But before last week’s Republican National Convention fades from view, let me focus instead on a development on the G.O.P. side that may, given everything else that has been happening, have flown under the radar: MAGA rhetoric on immigration, which was already ugly, has become even uglier.

Until now, most of the anti-immigration sloganeering coming from Donald Trump and his campaign has involved false claims that we’re experiencing a migrant crime wave.

Increasingly, however, Trump and his associates have started making the case that immigrants are stealing American jobs — specifically, the accusation that immigrants are inflicting terrible damage on the livelihoods of Black workers.

Of course, the idea that immigrants are taking jobs away from native-born Americans, including native-born Black Americans, isn’t new. It has, in particular, been an obsession for JD Vance, complete with misleading statistical analysis, so Trump’s choice of Vance as his running mate in itself signals a new focus on the supposed economic harm inflicted by immigrants.

So, too, did Trump’s acceptance speech on Thursday, which contained a number of assertions about the economics of immigration, among them, the notion that of jobs created under President Biden, “107 percent of those jobs are taken by illegal aliens” — a weirdly specific number considering that it’s clearly false, because native-born employment has risen by millions of jobs since Biden took office.

What seems relatively new, however, is the attempt to pit immigrants against Black Americans. True, Trump prefigured this line of attack during his June debate with Biden, when he declared that immigrants are “taking Black jobs,” leading some to mockingly question which jobs, exactly, count as “Black.”