President Donald Trump on Wednesday called on Attorney General Jeff Sessions to end special counsel Robert Mueller's Russia investigation, one of the most direct demands he has made of the Justice Department to stop the probe since it began.

"Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further," the president said in a morning tweet.

Sessions recused himself from overseeing the investigation into Russian interference in the 2016 U.S. presidential election over conflict of interest concerns, because he had served as a surrogate for Trump's campaign.

Trump has repeatedly slammed Mueller's probe investigating Russian interference in the 2016 U.S. presidential election, including any potential communication with the Trump campaign.