President Donald Trump has met with Jared Isaacman to discuss another nomination to lead NASA , a source familiar with the talks confirmed to CNBC's Morgan Brennan .

Isaacman, who has close ties with SpaceX CEO Elon Musk , was at the White House in September for Trump's dinner for tech power players. Musk did not attend.

Trump and Isaacman have had multiple in-person meetings in recent weeks to talk about the Shift4 founder's vision for the space program, according to Bloomberg , citing a person familiar with the meetings.

After a fiery back-and-forth between Musk and Trump over government spending, the president pulled Isaacman's nomination for the post, saying he was a "blue blooded Democrat, who had never contributed to a Republican before."

"I also thought

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