Hillary Clinton lobbed the video equivalent of a Nazi buzz bomb at Donald Trump on Saturday by making his German heritage a campaign issue.

The 37-second clip decrying Trump’s attacks on federal Judge Gonzalo Curiel’s Mexican heritage was subtle — but fans and foes got the message: Clinton thinks Trump, like the Nazis, hates people based on their race.

“His heritage is German. Heil Trump!” tweeted Trump foe Michael Gilmor‏.

“We can all hear the ‘dog whistle’ — she’s calling ‘Drumpf’ a Nazi because he’s German,” posted James Sweitzer.

The clip, backed by ominous music and linked on Twitter, ostensibly concerns Trump’s continued attacks on Curiel, who is presiding over class-action lawsuits brought by Trump University students who claim they were ripped off.

Curiel was born in Indiana to Mexican immigrants. Trump, who wants to build a wall between the US and Mexico and deport illegal immigrants, says Curiel’s heritage makes the judge biased against him.

“We are dealing with somebody who is a demagogue, who would rip up our most valued beliefs,” Clinton says in the video clip.

“Yes, [Curiel is] of Mexican heritage. Donald Trump is apparently of German heritage. I mean, what does that mean? We’re all Americans.”

Clinton released the video the day after she told a crowd at a California rally, “We’re electing a president, not a dictator.”

It’s not the first time Clinton has blitzed Trump with metaphorical Messerschmitts.

Last August, Clinton played the Hitler card against Trump by asserting that he and the GOP want to “go and literally pull [illegal immigrants] out of their homes and their workplaces.”

“Round them up, put them, I don’t know, in buses, boxcars, in order to take them across our border,” she then sniped, in a clear reference to the trains that transported doomed innocents to concentration camps.

Conservative analysts noted the underhanded subtlety of Clinton’s message.

“Classic Hillary, shoving the knife between the ribs without leaving any fingerprints,” said conservative opinion columnist and Republican political consultant Bill O’Reilly.

“The World War II generation and their children are no doubt noting what she is implying, but she did it in a way that gives her plausible deniability,” O’Reilly said.

“She’s slick.”

Undaunted, Trump doubled down on his broadsides against illegal immigrants on Twitter on Saturday morning.

“Many of the thugs that attacked the peaceful Trump supporters in San Jose were illegals,” he tweeted, in reference to Thursday’s violence-plagued rally.

Protesters carried signs reading, “A vote for Trump is a vote for fascism.”

“They burned the American flag and laughed at police,” Trump added.

Experts, meanwhile, cautioned that Clinton’s attacks could backfire.

Rich Flanagan, a professor of political science at the College of Staten Island, noted that German-Americans are the largest ethnic group in the US.

“Especially in the swing states in the upper Midwest — Indiana, Ohio,” Flanagan said.

“This week, she started to swing in this more tough direction, but maybe she overdid it.”

The presumptive Democratic nominee’s poll numbers have not appeared to suffer any as a result.

A Reuters/Ipsos poll released Friday showed her with an 11-point general-election lead over Trump among likely voters.

It’s the first double-digit edge she has had in the survey since May 4.