The former head of Israel's space program has claimed aliens are hiding on Earth and have reached an agreement with US President Donald Trump to stay quiet while they conduct experiments here.

Prof Haim Eshed, who holds a degree in electronics engineering, a master's in performance research, and a doctorate in aeronautical engineering, made the claims in an interview with Israeli paper Yedioth Aharonoth, the Jewish Press reported.

"The aliens have asked not to announce that they are here, humanity is not ready yet," Eshed reportedly said.

"Trump was on the verge of revealing, but the aliens in the Galactic Federation are saying: 'Wait, let people calm down first'. They don't want to start mass hysteria. They want to first make us sane and understanding."

He claimed the aliens are "waiting for humanity to evolve" and get to a place where people have a better understanding of space, aliens and UFOs, the Jewish Press reported.

"There's an agreement between the US government and the aliens. They signed a contract with us to do experiments here. They, too, are researching and trying to understand the whole fabric of the universe, and they want us as helpers."

Eshed said the aliens are currently working on Earth and on an "underground base in the depths of Mars". He also claimed there are American astronauts already at the base.

During the interview, Eshed said he understood that the claims sound like science fiction, but he said some of his workmates are starting to believe it.

"If I had come up with what I'm saying today five years ago, I would have been hospitalized. Wherever I've gone with this in academia, they've said: 'the man has lost his mind'. Today they're already talking differently. I have nothing to lose. I've received my degrees and awards, I am respected in universities abroad, where the trend is also changing."

US Presidents have remained quiet on their potential knowledge of the extraterrestrial.

Barack Obama said on an episode of Jimmy Kimmel Live! he wasn't allowed to reveal anything because the aliens "exercise strict control over us".

In 2019 Democratic candidate Bernie Sanders pledged to reveal the truth about the country's interactions with extraterrestrials if he was elected.

However he suspended his campaign in April 2020, leaving Joe Biden - who went on to become President-elect- as the Democratic nominee.