George Clooney calls Trump's presidential candidacy a 'crazy period'

The American actor-turned-activist also weighed in on the refugee crises by saying it is a global issue that extended beyond the Syrian refugees.

His comments followed a private meeting between Clooney and his wife, human rights lawyer Amal Alamuddin with the German Chancellor Angela Merkel, as well as ex-UK foreign minister David Miliband.

Clooney said he did not think Trump would become US president in response to questions about the latter's call for a ban on Muslims entering the US and a wall to separate the US from Mexico.

"We go a little crazy during the political season and it's a very long season," Clooney said.

"I think it was Winston Churchill who said, 'You can always count on Americans to do the right thing, after they have exhausted every other possibility.' So you know it's all going to be fine, it's just going to take us a minute."

Ex-British foreign minister David Milliband said the private meeting saw the parties discuss solutions to a "global problem".

"For me the refugee crisis is not just the Syrian refugees" Clooney told Reuters.

"You know there's still IDP's [internally displaced people] and refugees in South Sudan, in Darfur, that's still millions of people and they are still dying."

"So it's really all over the world, 60 million displaced people right now in the world, it's just a terrible, terrible time for it," he said.

Clooney became the celebrity-voice for the support of the people of Darfur after Omar Hassan al-Bashir's government backed campaigns against the indigenous people of Darfur leading to thousands of deaths and leaving millions displaced.