In May last year, Comey posted a photo on social media showing shells on a beach arranged to form the numbers "86 47", with the caption: "Cool shell formation on my boardwalk."
Trump was elected the 47th president of the United States, and the number 86 may refer to an expression meaning to get rid of something.
Republicans have claimed it was a threat, while Comey said he "didn't realize that some people associate these numbers with violence."
A lawsuit against Comey also began last year on charges of perjury. A federal judge dismissed that charge.
Trump fired Comey in 2017 during an investigation into whether any member of Trump's election campaign had colluded with Russia.
