Former Director of National Intelligence James Clapper on Thursday said the "beautiful letter" he sent to President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE after Trump won the presidential election was actually one of two similar notes he was prepared to send to whichever candidate was elected.

Clapper's comments add to an ongoing feud between himself and Trump. Clapper earlier this week blasted Trump's speech at an Arizona rally and raised questions about Trump's fitness for office.

In response, Trump tweeted Thursday morning criticizing Clapper and asking if he would show the world the "beautiful letter" he was sent after the election.

James Clapper, who famously got caught lying to Congress, is now an authority on Donald Trump. Will he show you his beautiful letter to me? — Donald J. Trump (@realDonaldTrump) August 24, 2017

Clapper told CNN that a version of the same letter was going to be included in a daily intelligence briefing to the winning candidate, whether it was Trump or Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE.

"The night before the election, we deployed two teams so that we would be ready to provide a [President's Daily Brief] the next morning to whomever won," Clapper told CNN. "I hand-wrote almost identical short notes to each of the two candidates to accompany the first brief as president-elect; only one actually got deployed — the one to him."

The notes prepared for both Clinton and Trump had a similar sentiment, Clapper said. Both congratulated the candidate on the victory.