Trump made the comment in a speech to U.S. servicemembers at MacDill Air Force Base in Tampa, Florida after receiving a briefing and eating lunch with troops.
Trump said to the troops in attendance...
"Radical Islamic terrorists are determined to strike our homeland as they did on 9/11, as they did from Boston to Orlando, to San Bernardino and all across Europe. You've seen what happened in Paris and Nice. All over Europe, it's happening. It's gotten to a point where it's not even being reported, and in many cases, the very, very dishonest press doesn't want to report it. They have their reasons, and you understand that."
Here is a video of Trump delivering his accusation...
Trump never explains what he meant by "their reasons".
There is no evidence that any media outlet has or is covering up terrorist attacks. As a matter of fact the very incidents Trump mentioned in his address were covered non-stop, some for weeks on end.
No one can figure out what Trump's motive behind his unsubstantiated attack and no one can figure what he hoped to achieve with this accusation.
In addition Trump never explains what the media would have to gain by not reporting acts of terror.
None of these questions were asked of and or answered by the Trump administration.
After the media pushed back on Trump's false claims the White House released a list of 78 domestic and international "terror attacks" that have taken place between 2014 and December 2016.
The document contains numerous factual errors, noticeably the word "Attacker" is misspelled more than two dozen times. Additionally several of the incidents listed involved no casualties and no injuries.
Given that no explanation was given as for why the white house circulated the list many were left to speculate that the administration simply wanted to induce fear in the general public in hopes to sway their opinion on Trump's recently signed Muslim ban.
Noticeably missing from the list was the terrorist attack on a Mosque in Canada last week that claimed the lives of 6 victims and left 8 others seriously injured. You can be sure that if Muslims had carried out the attack it would have made the list.