President Trump's national security adviser, Michael Flynn, reportedly has no plans to resign from his post.

A senior administration official told CNN that Flynn also does not expect to be fired.

The official appeared to raise questions about Flynn's future in the Trump administration, however.

"The knives are out," the official said. "There's a lot of unhappiness about this."

The comments come after reports that Flynn talked about sanctions against Russia with the country's ambassador before Trump was sworn in.

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The report, which cites current and former U.S. officials, contradicts Flynn's earlier comments that he never discussed the topic with Russian Ambassador Sergey Kislyak during a series of phone calls the month before Trump took office.

A spokesman for Flynn walked back that denial last week, saying that while Flynn "had no recollection of discussing sanctions, he couldn’t be certain that the topic never came up,” according to The Washington Post.

Vice President Pence told CBS in January that Flynn never spoke about sanctions during his calls to Russia.

“General Flynn has been in touch with diplomatic leaders, security leaders in some 30 countries. That’s exactly what the incoming national security advisor should do,” Pence told CBS anchor John Dickerson in January.

“But what I can confirm, having spoken to him about it, is that those conversations that happened to occur around the time that the United States took action to expel diplomats had nothing whatsoever to do with those sanctions."

When asked Sunday about whether the president still has confidence in Flynn, policy adviser Stephen Miller declined to answer, saying that was a question that should be directed toward the president.