Carlson asked in the interview, which was recorded Monday after Trump's summit with Russian President Vladimir Putin in Helsinki. Fox host Tucker Carlson asked.
Trump answered: "I understand what you're saying".
This interview has gone viral on social media where people are comparing Trump's declaration to the famous article of May 4, 1939, which asked: "Why die for Danzig?", which encouraged Hitler to invade Poland in September of that year. The Trump replied, "Montenegro is a tiny country with very strong people".
"By the way, they're very strong people". They are very aggressive people, they may get aggressive, and congratulations, you are in World War III.
NATO's common defence clause has only been invoked once - by America after the September 11, 2001 terror attacks conducted by Al-Qaeda.
Montenegro reportedly pledged more troops to help fight the US's longest war in Afghanistan.
"Trump doesn't know us well enough".
There was a huge backlash in the U.S. because even Trump's own supporters were dismayed to see him value the Russian dictator's words more highly than those of American intelligence professionals.
After the Helsinki summit on July 16, Trump appalled United States politicians by appearing to side with Putin against his own intelligence agencies over allegations of Russian meddling in the 2016 USA presidential elections.
"The Senate voted 97-2 supporting its accession to #NATO". A majority of Americans never wanted a Trump presidency, and yet the Republican Congress has done nothing to restrain Trump's risky impulses.
"Interpreting Trump's comments is a treacherous business, he says one thing at noon and another at 1 p.m." said Charles Kupchan, a senior fellow at the Council on Foreign Relations who served in the Obama Administration. Prior to joining NATO, Montenegro assisted in Afghanistan's reconstruction efforts for almost eight years. It also hopes to join the European Union, much to the dismay of Putin, who sees the West perennially creeping toward Russian Federation. Within a day he had been forced to admit, for the first time, that there had indeed been Russian meddling in the United States election process in 2016. "But yes, if I were a member of North Atlantic Treaty Organisation and saw the most powerful country in the alliance repeatedly question the American commitment to stand by collective defense, I would be unsettled". "If there's been aggression, it's come from Moscow, not Montenegro".
The comments drew immediate outrage and ridicule from commentators.
But Montenegrin officials insist Trump has nothing to worry about.
Earlier this week, President Trump identified a seemingly unlikely threat to world security: Montenegro, a tiny Balkan country of just over 600,000 people. Publicly and privately officials admit that the USA president's latest verbal volley has hurt. "So if you allow it to happen, why are you complaining about it?"