The somewhat vague tweet seems to refer to Rosenstein, who wrote a memo outlining an argument against former Federal Bureau of Investigation director James B. Comey. Sad!" Trump tweeted. "Despite the phony Witch Hunt going on in America, the economic & jobs numbers are great.
It was not clear whether the president was basing his tweet on direct knowledge, or on reports this week that special counsel Robert Mueller is examining whether he obstructed justice by firing Mr Comey last month amid the Russian Federation probe.More news: Dozens killed, wounded in attack on Afghanistan police headquarters
It is not clear, however, if Trump was referring in Friday's tweet to Mueller or Deputy Attorney General Rod Rosenstein, who wrote a letter to Attorney General Jeff Sessions recommending that the president fire Comey.
Justice Department officials did not provide further context for the statement, but it came within hours after The Washington Post reported that the special counsel's investigation had expanded to include questions about Mr. Kushner's business dealings.
Rosenstein also appointed Robert Mueller to investigate ties between Trump's campaign and Russian Federation.More news: Scalise Shooting Suspect Campaigned for Bernie Sanders
When The Washington Post reported this week that Mueller was investigating Trump for obstruction of justice, a spokesman for the President's private attorney called the leak "outrageous, inexcusable and illegal".
The president did not directly address allegations that he is being probed for possibly obstructing justice - a potentially impeachable offense. "Witch Hunt", Trump tweeted on Friday morning.More news: Kiwis back to challenge United States in America's Cup