The US president made clear that the benefits of good relations with the kingdom outweigh the possibility its crown prince ordered the killing.
The idea prompted White House lawyers to prepare a memo warning of consequences ranging up to possible impeachment, The New York Times reports.
Christopher Watts dumped the bodies in containers of crude oil in August. His wife's dad labelled him a "heartless monster".
Sunday sat down with Greg Foran who runs Walmart, the largest retail chain in the world.
China's Xi Jinping and US Vice President Mike Pence traded barbs as the summit, attended by Jacinda Ardern, kicked off.
Relatives say the victim's daughter was forced to use a wheelchair and undergo unnecessary medical procedures.