The Department of Justice said President Trump has not asked Attorney General William Barr to contact Ukraine.
Here's the full statement from Justice spokesperson Kerri Kupec:
The Attorney General was first notified of the President's conversation with Ukrainian President Zelensky several weeks after the call took place, when the Department of Justice learned of a potential referral. The President has not spoken with the Attorney General about having Ukraine investigate anything relating to former Vice President Biden or his son. The President has not asked the Attorney General to contact Ukraine -- on this or any other matter. The Attorney General has not communicated with Ukraine -- on this or any other subject. Nor has the Attorney General discussed this matter, or anything relating to Ukraine, with Rudy Giuliani
A Department of Justice team led by U.S. Attorney John Durham is separately exploring the extent to which a number of countries, including Ukraine, played a role in the counterintelligence investigation directed at the Trump campaign during the 2016 election. While the Attorney General has yet to contact Ukraine in connection with this investigation, certain Ukrainians who are not members of the government have volunteered information to Mr. Durham, which he is evaluating.