A Bronx state senator has sent out a campaign mailer linking his Democratic primary rival to Donald Trump — even though the challenger has spoken out against the Republican presidential nominee.

The mailer sent to voters shows a picture of Councilman Fernando Cabrera, who is challenging Sen. Gustavo Rivera, next to a photo of Trump.

But the mailer — with the headline “Tell Me Who Your Friends Are and I’ll Tell You Who You Are” — does not identify who paid for it.

After The Post inquired about the mailing, Rivera’s campaign owned up to its responsibility.

Cabrera, who is also a minister, participated in a rally outside City Hall last December to denounce Trump’s comments on immigrations and Muslims.

“This is a smear,” said Cabrera campaign manager Michael Olmeda.

“Rivera is doing what Trump does — he’s being a bully.”