President Trump has taken aim at a new report that indicates he's under investigation for possible obstruction of justice. The reports is in reference to the current investigation by the special counsel into alleged Russian interference in the 2016 U.S. presidential election and possible collusion with the Trump campaign. Special counsel Robert Mueller is leading the probe. Mueller was hired days after former FBI director James Comey's firing in May. The obstruction of justice investigation into Trump began days after Comey was fired on May 9, according to people familiar with the matter, the Washington Post said.