Republican congressional candidate John Faso in recent days has opened up a specific line of attack against his primary opponent Andrew Heaney over a 2007 contribution to then-presidential candidate Barack Obama.

A radio ad that has been airing in the Albany market includes audio of Heaney, a businessman in the energy industry, acknowledging the contribution to Obama.

“That’s New York City millionaire who donated thousands to make Obama president,” the narrator of the ad states.

At the same time, Faso has released a fundraising email blasting Heaney for the contribution as well.

“Who do you want representing you in Congress?” the email states. “A maxed out Obama donor who now says he is a “Republican,” or a trusted reformer who has spent his career fighting for a better New York?”

The appeal directs supporters to the radio spot, along with a plea for donations.

“It’s essential that voters are informed about the candidates running to fill this important seat,” Faso’s email says. “Help us stay on the air with a contribution of $25, $50, $100, $250 or $1,000.”

Updated: Heaney spokesman David Catalfamo responded, linking Faso to the donations his lobbying firm Manatt, Phelps and Phillips made through a political action committee.

“It’s not surprising that the Faso campaign would be first out of the box with a negative attack, probably because he can’t explain his own PAC contributions to Obama, Reid, Pelosi or his five year lobby ban,” he said.

The attack has been a long gestating one within the Faso campaign, but hasn’t come in the form of negative advertising until now, more than a month before the Republican primary in the 19th congressional district.

Heaney’s campaign, as well as a super PAC supporting him, has knocked Faso for his lobbying work after leaving the Assembly a decade ago.

Whether an attack over a past contribution to a Democratic candidate by a Republican will resonate with GOP primary voters in the Hudson Valley House district remains to be seen. Criticism of Donald Trump’s past support for Democratic elected officials by his Republican rivals did little to stop his march to the GOP nomination.