The former singer, who quit the group to focus on his interest in aliens, was thrown into the headlines after it emerged he was emailing Mrs Clinton’s campaign manager John Podesta, another UFO truth seeker, about the out of this world topic.
In a message posted on Instagram, DeLonge said: “Wikileaks really messed some important stuff up.
“What seems like ridiculous subject matter to most, is of massive importance to admirable National Security Leadership.
“It’s easy to poke fun about the topic from an armchair, but unless you’re invited to the meetings I have been a part of, then…no more laughing.
“Big things are coming. Project is still on, believe it or not, things just got bigger. #SekretMachines.”
Last week, it was revealed by Wikileaks that DeLonge had sent multiple emails to Mr Podesta, concerning proposed meetings and even military whistleblowers he was working with.
In one, he even told Mrs Clinton’s team where the remains of the ‘Roswell crashed flying saucer’ were taken and stored away from public view – claiming it was the Wright-Patterson US Air Force (USAF) base, in Ohio, which contains the Air Force Research Laboratory to develop aerospace warfare technologies, with a budget of around $3billion.
Mr Podesta and Mrs Clinton have vowed she will make public as many classified government files on the subject as possible if she wins the race to the White House.
Two e-mails from Mr DeLonge to Mr Podesta sent last year were released by Wikileaks.
In DeLonge identifies a top source, who he claims worked at “where the remains of the Roswell UFO crash” were taken and stored until very recently.
In an e-mail entitled “General McCasland”, he wrote that he had been working with the named former military official on the Roswell mystery and hinted he may be about to turn whistleblower.
DeLonge is believed to be referring to Major General William McCasland, who was commander of the Air Force Research Laboratory, at Wright-Patterson, until retiring in October 2013.
Roswell has been at the heart of the UFO scene since in July 1947 the military sensationally announced in a press release it had found the remains of a crashed flying saucer in the desert nearby.
But the following day it retracted the statement, saying it was in fact a damaged US Air Force air balloon.
Witnesses later came forward to say there had been alien bodies within the “crashed craft”, which along with the wreckage were then taken away.
It is not clear if Mr Podesta replied to the e-mails or had any meetings.
But, upon leaving Barack Obama’s administration he tweeted that his “biggest failure” was “not securing the #disclosure” of the UFO files.