"We are looking at Heather," said Trump by referring to Heather Nauert, spokeswoman for the State Department, but also adding that "We're looking at numerous people."
While Trump had accepted Haley's resignation as US ambassador to the UN last month, Haley would remain in the post until the end of the year.
Trump said last week that Nauert was "under very serious consideration" for the post.
Nauert, 48, a former anchor at Fox News Channel, has worked for the State Department as a spokeswoman since April 2017. She was named acting undersecretary for public diplomacy and public affairs earlier this year.
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