An official in the Delaware Republican Party resigned from the party over the leadership of the state’s GOP and the nomination of Rob Arlett for the Senate, The News Journal reported on Wednesday.

Peter Kopf, who has served in the state party's executive committee since last year, explained his decision to resign in a letter to his fellow members last week that was obtained by the news site.

“Mr. Arlett lacks the character and integrity needed to lead our Ticket and receive my support,” wrote Kopf, according to The News Journal.

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The 64-year-old Republican official also referenced “critical information” about Arlett in the letter that he alleges “will eventually derail his candidacy.”

Arlett did not immediately reply to a request for comment from The Hill. The News Journal said Arlett was not immediately available for comment.

Kopf told the News Journal that he is "disturbed" that his resignation letter, which was sent to party leaders in a Sept. 13 email, was made public.

"That was a private email," he said. "There's not much to comment on. It's all pretty clear in the letter."

Kopf was not immediately reachable by The Hill.

In the letter, Kopf also alleged that two convicted felons had been allowed to serve in public positions within the Delaware GOP. He did not name who he was referring to.

“This all should be very disturbing and an embarrassment to any individual serving on the State Executive Committee today,” Kopf wrote. “You all have a responsibility to Republicans throughout Delaware to keep our Party ethical.”

Emily Taylor, the Delaware Republican party’s vice chairwoman and executive director, said in a statement to The News Journal that the party is “sad” to see Kopf leave.

“The party is sad to see Peter leave but he had to make the decision that is right for him,” she said. “We’re focused on winning elections in November."

When pressed about Kopf’s accusations against Arlett, Taylor responded to the News Journal: “Rob Arlett is the Republican-endorsed candidate and the party will fight for him to be our next U.S. Senator.”

The Delaware Republican party was not immediately reachable for comment.