President Obama unleashed on Rep. Darrell Issa late Sunday, calling the California Republican a "shameless" congressman who has only managed to waste taxpayer dollars during his tenure.

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Speaking at a Democratic fundraiser in California in support of Democratic challenge Doug Applegate, Obama charged that Issa was Republican presidential nominee Donald "Trump before Trump."

"This guy has spent all his time simply trying to obstruct, to feed the same sentiments that resulted in Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE becoming their nominee," Obama said.

"Issa's primary contribution to the United States Congress has been to obstruct and to waste taxpayer dollars on trumped-up investigations that have led nowhere."

Obama also hit Issa over using a photo of the president in Issa's campaign mailers "touting his cooperation on issues with me."

.@ApplegateCA49 New Issa mailer: Brags abt basic decency, aligns w Obama after trying to ruin HRC. Go Team g8! pic.twitter.com/extxeWQgxv — (((em))) (@controlpremium) October 16, 2016

"Now, that is the definition of chutzpah," Obama said.

"Here's a guy who called my administration perhaps the most corrupt in history — despite the fact that actually we have not had a major scandal in my administration — that, when Trump was suggesting that I wasn’t even born here, said, well, I don’t know, was not sure. We can pull up the quotes," Obama said.

"And now he’s sending out brochures touting his cooperation with me. Now, that is shameless."

Issa is fighting a competitive race against Applegate as Democrats look to boost their numbers in the House.