Former longtime presidential adviser David Gergen on Friday said senior White House adviser and Trump son-in-law Jared Kushner should consider taking a leave of absence now that he's part of the FBI's investigation into Russian election meddling.

"I think that Jared Kushner should be considering the possibility in a serious way of taking a leave of absence," Gergen said.

Kushner, the husband of Ivanka Trump, has served as an official adviser to President Trump since January. He is currently being investigated over his meeting with a Russian banker close to President Vladimir Putin during the presidential transition in December. Reports said he sought to create a secret back channel for communication between Trump's team and Russia.

"He cannot be in a position where it's later claimed that he's witness-tampering. People around him are going to eventually testify. If he goes up and gives them instructions about how to think about this or that, that can be considered tampering," said Gergen, who served as an adviser to presidents Nixon, Ford, Reagan and Clinton.

During Friday's White House press briefing, press secretary Sean Spicer directed a question about Kushner's meeting to outside counsel.

"We're focused on the president's agenda, and going forward all questions on these matters will be referred to outside counsel Marc Kasowitz," Spicer said.

When asked if the president still has confidence in Kushner, Spicer responded, "absolutely."