'I don't want to see scientists being punished, and this having negative effects on our science.'
Three-man crew included Tim Peake, the first Brit aboard the space station.
On Sunday, he will take part in the London Marathon on a treadmill.
The astronaut is about to come back to Earth after spending 340 consecutive days in space along with Russian cosmonaut Mikhail Kornienko.
A new crew is en route to the ISS. NASA TV has coverage of the docking and hatch opening.
Tim Peake is due to fly to the International Space Station on Tuesday morning.
One crew returns from the ISS after 141 days in space as another prepares to launch on Tuesday.
Tim Peake ran the London Marathon in 1999. In 2016, he'll do it again, from the ISS.