President Donald Trump tweeted this morning that the "low-life leakers" behind recent reports of his alleged connections to Russian officials will be "caught."

The comment comes after the resignation of National Security Adviser Michael Flynn, who was found to have discussed sanctions with the Russian ambassador before Trump's inauguration. 

Flynn had maintained to the White House that sanctions were not discussed.

Judge Andrew Napolitano weighed in this morning on "Fox & Friends," saying the people who leaked the intelligence will never be identified.

Napolitano said that Flynn, former director of the Defense Intelligence Agency, would have known that his conversations with Russian Amb. Sergey Kislyak were being recorded.

But the judge said Flynn believed the calls were being monitored by "patriots," not people who would seek to undermine the president and "destroy" Flynn.

The judge said there is basically a "shadow government" - made up of professional spies - who are seeking to "control and frustrate" the president.

The Wall Street Journal reports today that U.S. intelligence officials have withheld sensitive intelligence from Trump because they are concerned it could be leaked or compromised.

Napolitano said he believes Trump and VP Mike Pence both knew Flynn was discussing sanctions with the ambassador as part of a pursuit with better relations with the Kremlin.

He argued there was nothing wrong with discussing the Obama-imposed sanctions with the ambassador. 

"My theory is people in the intelligence community feared Mike Flynn because he was one of them and knew too much about them and knew about their sources and methods," said Napolitano. 

Watch the judge's analysis above.

Piers Morgan: Media's Attempt to Delegitimize Trump Is 'Un-American'

O'Reilly: Media 'Talking Trash' About Trump & Russia With No Credible Evidence

Shapiro: Media 'Sound Like Used Car Salesmen' About Flynn Resignation