U.S. President Donald Trump has caused much controversy following his meeting with his allies at the NATO summit in Brussels, discussing the future of NATO and the defense spending of the member states.

Lt. Colonel Ralph Peters, former strategic and military analyst for Fox News, slammed Trump in an interview on the CNN's "Anderson Cooper 360." He strongly criticized Trump's behavior saying that: "We're faced with the real, immediate and perhaps irreparable damage to this greatest of alliances, NATO." Peters continues, saying that "one thing that Trump is indisputably brilliant at is propaganda."

>>What Trump gets right - and wrong - about NATO | Analysis

When talking about how the other NATO leaders dealt with Trump, he said, "It was like watching psychiatrists patiently deal with a disturbed child. Trump is not only shaming our nation, he is doing real damage to our security, to our interests and to our allies and Vladimir Putin could not be happier."

While commenting on Trump's statement that "Germany is a captive of Russia", Peters praised Angela Merkel saying she is the "greatest chancellor that Germany has had since the early post war years" and that she has "held the [NATO] alliance together against Putin."

Peters concluded with saying that Merkel is an "admirable leader, God knows I wish we had a leader like that ourselves, instead we have a fool for a president."