"As the president's lawyer, I can't be concerned on what effect it may have", he said.
Giuliania told the AP that the probe's conclusion would be the "culmination of the investigation into the president".
What does the new expanded probe involve?
DOJ spokesperson Sarah Isgur Flores said in a statement that the inspector general would consult with "the appropriate USA attorney" about whether there is any evidence of potential criminal conduct, The Hill reported.
Bruce Fein, a former USA associate deputy attorney general, says there are valid reasons for the Russian investigation as too many people from Trump's campaign team associated with foreign officials.
"If anyone did infiltrate or surveil participants in a presidential campaign for inappropriate purposes, we need to know about it and take appropriate action", Mr Rosenstein said in a statement.
The special counsel's office did not respond to a request for comment.
Wittes also predicts Attorney General Jeff Sessions, Deputy Attorney General Rosenstein, and FBI Director Christopher Wray will not comply with Trump's order.
Director of National Intelligence Dan Coates was also present. Analysts described his demand for an investigation of the investigation as unprecedented.
Earlier this month, the National Review raised the question of a possible Federal Bureau of Investigation spy in Trump's campaign. The probe will focus on whether or not the FBI engaged in any political motivation or impropriety in the way it conducted its investigation into potential Russian election interference. Comey later testified to Congress that internal reviews found no information to support the president's tweets.
Trump, late last week, began accusing the Justice Department of trying to frame him by planting a spy in his campaign - an allegation his own lawyer said might not be true.
Senate Passes Resolution To Save The Internet
She closed with a promise that will have avid The FCC watchers excited about the next few episodes. The Senate yesterday voted 52-47 to reverse the FCC repeal of net neutrality rules.
That particular bomb appears to have been defused - at least for now.
He echoed Trump's concerns that an extended investigation could hurt Republicans in the November congressional elections. This time may be no different.
Ned Price, who served on the National Security Council under President Barack Obama tells VOA that Trump's charge is unsafe to American democracy.
Trump tweeted Sunday afternoon to double down on his intentions to investigate reports that Cambridge professor Stefan Halper, 73, was an alleged secret informant who met with Trump campaign advisers Carter Page and George Papadopoulos dating back to the 2016 Trump presidential campaign.
The informant - an American academic working in the United Kingdom - had made contact with George Papadopoulos and Carter Page, the report said.
They have argued that doing so would put the alleged informant's life - or that of his contacts - in danger. Whether Republican or Democrat, they steered well clear of individual investigations, leaving those investigations to the professional - nonpolitical - judgment of Justice Department employees. He has been identified by some U.S. media outlets but others have not, at the request of American intelligence officers who argue the disclosure could hamper other investigations.
What is the informant's connection to Mueller?
It's now folding Trump's demand into that investigation.
But Mr Trump and his supporters have multiplied their attacks on the special counsel's work.
"Things are really getting ridiculous", Trump complained in one the Twitter remarks, asking at what point the investigation will end, calling it a "soon to be $20,000,000 Witch Hunt".