Lots of claims like this. Zero evidence. Grist for the UFO mill. The entire alien visitation narrative has failed to produce one scrap of credible evidence despite numerous detailed claims over several decades.
If they really want to research us for some reason, they could surely do that in secret if they're capable of secreting away astronauts to a joint Mars base, as claimed.
Just for fun in entertaining the idea, maybe they've already been doing their own secret tests throughout history and are trying to slowly start interacting with humans now, and starting on Mars with governments could be a small first step?
:)
Please. Even if I could believe aliens hiding out in a secret base on Mars, there is no way on God's green earth I'm buying Trump choosing discretion as the better part of valor.
He'd be on Twitter blaming the Democrats for collaborating with alien invaders in a minute.
Maybe in exchange for a Trump Hotel on Mars's moon Phobos?