White House aide declines to back Flynn over Russia contact
Mr Flynn reportedly discussed sanctions with Russian ambassador Sergei Kislyak in the weeks before the inauguration.
He denied talking about this issue but later said he could not be certain.
Any discussion of sanctions could have violated laws against private citizens engaging in foreign policy.
Stephen Miller, President Donald Trump's top policy adviser, declined to say when asked in a number of interviews whether Mr Trump backed Mr Flynn.
Mr Miller said it was not his place to comment on the "sensitive matter" concerning Mr Flynn, who was an early supporter of Mr Trump but whose position in the administration is thought to be under scrutiny.
Asked if the president still had confidence in Mr Flynn, Mr Miller responded: "That's a question for the president." Other White House officials have also refused to comment.
Kremlin spokesman Dmitry Peskov told reporters on Monday that Mr Flynn and Mr Kislyak did not discuss lifting sanctions.
The controversy comes as Mr Trump faces his first major national security challenge, following the test by North Korea on Sunday of a ballistic missile.
Mr Flynn would ordinarily be closely involved in determining the US response to such a test.
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