U.S. President Donald Trump's son-in-law Jared Kushner is cooperating with a wide-ranging probe by the U.S. House Judiciary Committee into Trump and possible obstruction of justice and abuse of power, a person knowledgeable about the matter said on Friday.

Just hours earlier, a lawyer for Trump adviser Roger Stone said in a letter seen by Reuters that Stone was not cooperating with the same committee and cited his right to avoid self-incrimination under the Fifth Amendment of the U.S. Constitution.

The contrasting responses to Judiciary Committee Chairman Jerry Nadler's probe targeting 81 individuals and groups came on the same day the Justice Department announced the completion of a report by Special Counsel Robert Mueller into Trump and Russian meddling in the 2016 presidential election.