Mayoral candidate Bo Dietl on Monday tweeted a picture showing Mayor de Blasio with activist Linda Sarsour, wearing a head scarf, and questioning whether he could be trusted to protect the city from terror.

"Can NYC trust this guy with our homeland security needs?" read the message attached to the photo of de Blasio and Sarsour.

The tweet was immediately derided by many on Twitter as racist, and was deleted — but a campaign spokesperson said the candidate only took it down because it didn't identify the woman in the photo as Sarsour.

Dietl followed up the deletion with another tweet: "Linda Sarsour is anti-Israel & a proponent of Sharia Law-These values' don't reflect the people of my NYC- @BilldeBlasio supports her!!"

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