"I have not spoken to counsel yet. I don't know how they're going to respond," White House spokesman Sean Spicer told reporters.

Comey was leading a Federal Bureau of Investigation probe into alleged Russian meddling in last year's U.S. presidential election and possible collusion by Trump's campaign when the president fired him last month.

Critics have charged that Trump was seeking to hinder the FBI's investigation by dismissing Comey.

The former FBI chief is due to testify on Thursday before the Senate Intelligence Committee as part of its own Russia-related investigation, and his remarks could cause problems for the Republican president.

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