President Donald Trump on Thursday said he was seriously considering naming U.S. State Department spokeswoman Heather Nauert to succeed Nikki Haley as U.S. ambassador to the United Nations, adding he would make a decision on the posting soon.

"She is under very serious consideration," Trump told reporters at the White House after announcing planned changes to U.S. immigration policy. "She's excellent. She's been with us for a very long time. She's been a supporter for a long time ... We'll probably make a decision next week."

ABC News reported on Thursday that Nauert was offered the job, citing an unnamed senior White House official. Fox News Channel also reported Nauert had been asked to take it on.