"Put big game trophy decision on hold until such time as I review all conservation facts. Under study for years. Will update soon with Secretary Zinke. Thank you!" Mr Trump tweeted, referring to Interior Secretary Ryan Zinke.
Just hours before, Mr Trump's spokeswoman Sarah Sanders had defended the US Fish and Wildlife Service's move to end the 2014 ban initiated under Trump's predecessor Barack Obama.
The service said Thursday that it would begin issuing permits to import "sport-hunted trophies from elephants hunted in Zimbabwe" between January 21, 2016, and December 31, 2018. Zambia would also have been covered under the revised rule.
The move was met with a barrage of criticism from animal rights groups and activists.
It also came on the same day that the US State Department presented to Congress its first annual report on wildlife trafficking which, it said, "remains a serious transnational crime."
French screen legend and animal rights activist Brigitte Bardot added her voice to the growing chorus of criticism, slamming Trump as "unfit for office" after his administration's "shameful actions."
"No despot in the world can take responsibility for killing off an age-old species that is part of the world heritage of humanity," Bardot said in a letter to Trump, released through Fondation Brigitte Bardot.
"Your shameful actions confirm the rumors that you are unfit for office."
According to the Great Elephant Census project, African savannah elephant populations fell by 30 percent between 2007 and 2014, while Zimbabwe saw a drop of six percent.
Despite an overall fall in poaching, Africa's elephant population has declined in part because of continued illegal killing, said a report this year by CITES, the Convention on International Trade in Endangered Species.
African ivory, in particular, is highly sought in China where it is a status symbol.
The US decision takes advantage of a provision in the Endangered Species Act, which says the import of such trophies can be legal if accompanied by proof that the hunting benefits broader conservation of the species.
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