The managers faced a major backlash on social media.
Botswana, where trophy hunting is banned, currently has the largest elephant population on the continent.
Kyle Richards, Naomi Campbell and Doutzen Kroes shared it to shame the hunter.
Dana Christensen will examine whether the protective status of bears should be reinstated.
The African lion population, which was declared vulnerable in 1996, has decreased 43 percent in the last 21 years.
Many also defended the Kentucky woman, pointing out trophy hunting was perfectly legal in many countries and arguing it contributes to conservation management efforts.
The two men had recently formed a new company called Future Venture LLC, according to a new report.
"Elephants still aren't trophies to decorate Eric Trump and Donald Trump Jr's walls," Jess Phoenix said.
After months of uncertainty about the status of the ban, the president told Piers Morgan he plans to keep restricting hunters from bringing back the trophies.
Lara Trump has a history of animal advocacy, but one group wishes she would ask her husband to stop killing them.
An Obama-era policy had banned the importation of endangered animals.
The 6-year-old cub, Xanda, was killed two years after the death of Cecil sparked international outcry.
Walter Palmer says he will return to work on Tuesday after a fierce backlash.
Some people feared the seven cubs might be killed by a new male lion trying to establish his dominance in the pride.
More than 3,000 lion parts were legally imported to EU countries from 2004 to 2013.
Wildlife conservation will not necessarily be enhanced by a total ban on hunting.