Former FBI Director James Comey has provoked an outcry from the Trump administration after he briefly posted a photo to Instagram that federal officials alleged was a call for violence against President Trump — a claim Comey pushed back on.

Comey removed and apologized for the post, which depicted a seashell message on a beach that spelled out “86 47,” saying he did not know people “associate those numbers with violence.”

Officials have vowed to investigate the former FBI director, alleging that a social-media post amounted to a threat against the president.