White House press secretary Sean Spicer on Friday did not deny the existence of secret recordings of conversations between President Trump and former FBI Director James Comey.

"The president has nothing further to add on that," Spicer said at the press briefing when asked about Trump's reference earlier in the day to possible "tapes" of their conversations.

Trump's tweet seemed to imply there are recordings of his conversations with Comey when the former FBI director supposedly told him three times that he's not under investigation when it comes to connections between Russia and the Trump campaign.

"James Comey better hope that there are no 'tapes' of our conversations before he starts leaking to the press!" Trump tweeted Friday morning.

When asked why Trump sent the tweet that he did earlier Friday or if the White House has recording devices in the residence or the West Wing, Spicer declined to comment.

Since President Nixon resigned from office in 1974, presidents have not been allowed to record conversations in the White House without notifying others they are being recorded. Nixon, Lyndon Johnson and John F. Kennedy all had recording devices installed in the White House to record what happened during their administrations.