The President's tweet sparked immediate speculation about the future of the official, Rod Rosenstein, who wrote a memo recommending Comey be ousted and also later approved the appointment of a special counsel - Robert Mueller - to lead the Russian Federation probe.
The Justice Department's investigation into Russian involvement in the 2016 election is looking at Kushner's multiple roles in the Trump administration, including the Trump campaign's 2016 data analytics operation; his relationship with former national security adviser Michael Flynn; and Kushner's own contacts with Russians, according to USA officials briefed on the probe.
Mr Trump was not under investigation before Mr Comey's firing, but reportedly is now facing scrutiny for obstruction of justice over the circumstances surrounding the ex-FBI chief's sacking, according to U.S. media.More news: Canada's Brooke Henderson wins Meijer LPGA Classic
U.S. Deputy Attorney General Rod Rosenstein has privately acknowledged he may need to recuse himself from matters relating to the Russian Federation probe, given that he could become a potential witness in the investigation, ABC News reported on Friday, citing unnamed sources. Rosenstein appointed Mueller following the recusal of Attorney General Jeff Sessions in the FBI's probe of Russian influence.
Adding to the confusion is the fact that the special investigation is being led by another former FBI director.
In an August 21, 2013 file photo, former Federal Bureau of Investigation director Robert Mueller speaks during an interview at Federal Bureau of Investigation headquarters in Washington DC.More news: Shot US Congressman Scalise undergoes surgery
Mark Corallo, spokesman for Trump's personal lawyer, Marc Kasowitz, said earlier this week that, "The FBI leak of information regarding the president is outrageous, inexcusable, and illegal". "Witch Hunt", Trump stated in a Twitter message. Mr Pence hired criminal lawyer Richard Cullen as special counsel Robert Mueller's investigation intensifies.
A person familiar with Mueller's inquiry, speaking on condition of anonymity, said on Thursday Mueller was looking into whether Trump or others attempted to obstruct the Russian Federation investigation.
The Washington Post reported on Wednesday that investigators were looking into possible obstruction of justice.
As head of the FBI, Comey had been leading the investigation until he was sacked by Trump on May 9.More news: Dozens killed, wounded in attack on Afghanistan police headquarters