Sarah Huckabee Sanders, White House press secretary, speaks to members of the media outside the White House in Washington, D.C., U.S., on Wednesday, Jan. 16, 2019.

Special counsel Robert Mueller's team has interviewed President Donald Trump's press secretary, Sarah Huckabee Sanders, she said Friday.

Sanders said she was happy to sit down with Mueller.

"The President urged me, like he has everyone in the administration, to fully cooperate with the special counsel. I was happy to voluntarily sit down with them," Sanders said in a statement to CNBC.

The interview occurred around the time that Trump's former chief of staff John Kelly, was questioned by Mueller's team, NBC News reported. That interview reportedly occurred in early fall of 2018.