told supporters Tuesday that they should stop reading newspapers and magazines and urged them to instead "read the internet."

"Forget the press, read the internet," the GOP presidential nominee instructed a crowd in Colorado Springs, Colo.

It's unclear what websites Trump was praising. Figures at several outlets such as Breitbart News, the right-wing website formerly chaired by Trump's campaign CEO Stephen Bannon, and Infowars, a site run by Alex Jones, a conspiracy theorist who rejects the government's account of the 9/11 attacks, have been outspoken in their support of Trump's candidacy.

Trump is working to make the theory that mainstream media outlets are part of a "rigged" system a central part of his campaign message. The system, in Trump's telling, is a conspiracy to undermine his campaign and destroy U.S. sovereignty by opening the country's borders on trade and immigration.

"Study over things," Trump advised his rally crowd Tuesday. "Don't go for the mainstream media."

"Good news," Trump added, "most of them won't be around for much longer in my opinion. They're going down."

Trump has trailed Clinton in a series of polls nationally and in a number of key battleground states as the pair take to the stage for their last debate Wednesday, just weeks before Election Day.

"I do get a lot of honesty over the internet," he added later in his speech.