“There are a lot of innocent people who are starving," the US president said. "There are a lot of innocent people who are in trouble and dying."
The human rights group's investigation accuses Israel of using US-made guidance weapons in two illegal strikes on homes filled with Palestinian families.
The Charity Commission said Viva Palestina's charitable funds donated by the public were "put at risk".
What you need to know about the current clashes.
UK calls for independent investigation.