Donald Trump reacted to news that Hillary Clinton’s campaign communicated with the Department of Justice (DOJ) during the department’s investigation and litigation into her use of a private email server, which was recently revealed by WikiLeaks.

“Wow. Unbelievable,” Trump posted on Twitter after an email revealed Clinton’s spokesman Brian Fallon communicating with the DOJ in May.

NEW: Hacked e-mails from Wikileaks appear to show Clinton campaign spokesman in touch with DOJ officials regarding e-mail litigation: pic.twitter.com/nlBZ3aHZh5 — Tom Winter (@Tom_Winter) October 11, 2016

Trump’s campaign also released a statement reacting to the email. Trump’s senior communications advisor Jason Miller stated:

Today’s report that Clinton’s campaign was in communication with the Obama Department of Justice on the email investigation shows a level of collusion which calls into question the entire investigation into her private server. The Department of Justice must release all communications with the Clinton campaign and her allies as soon as possible in order to definitively prove their investigation was completely above board.

Trump has previously questioned whether or not there was collusion between the DOJ and the Clintons regarding the investigation into the private email server.

Does anybody really believe that Bill Clinton and the U.S.A.G. talked only about "grandkids" and golf for 37 minutes in plane on tarmac? — Donald J. Trump (@realDonaldTrump) July 3, 2016