White House Press Secretary Sean Spicer was challenged on a tweet from President Trump about former Director of National Intelligence James Clapper's characterization of the Russia investigation.

Trump was referring to past statements by Clapper in which the former DNI said he had not seen evidence of collusion between the Trump campaign and Russia. 

Clapper clarified in an interview Friday, saying he wouldn't have known about collusion, which is the subject of an ongoing FBI counterintelligence investigation.

"So I don’t know if there was collusion or not," said Clapper. "I don’t know if there was evidence of collusion or not, nor should I have in this particular context."

Spicer was asked by NBC News' Kristen Welker about Clapper's statements. Welker asked why Trump is still "leaning on" Clapper's statements as a defense.

Spicer pointed out that Clapper was director of national intelligence up until Jan. 20, suggesting Clapper would have known if collusion had occurred. He questioned why Clapper has now "shifted his story" today. 

"Why did he say what he said before?" Spicer asked, saying Clapper repeatedly stated he hadn't seen evidence of collusion.

Watch the exchange above.

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