WASHINGTON (Reuters) - US special investigator Robert Mueller on Wednesday announced his resignation from the Justice Department after an investigation into the complicity of US President Donald Trump's campaign with Russia's intervention in the 2016 election to sway his challenger against Democratic challenger Hillary Clinton.

At a press conference today, Muller confirmed the end of the investigation into the Russian intervention in the 2016 presidency.

The private investigator said US President Donald Trump's indictment of the crime of obstructing justice was not a viable option because of the Justice Department's policy.

"The Office of the Special Inspector is part of the Ministry of Justice, and legally it is obliged to implement the policy of this ministry," he said in his first public statement two years ago. "The indictment of a head of a crime is not an option we can study."

At the same time, Müller confirmed that his report on the Russian intervention in the 2016 elections did not absolve the president.

"If we had the confidence that the president clearly did not commit a crime, we would say that, but we have not reached a decision on whether the president has committed a crime," he said.

The private investigator said no federal charges could be brought to the US president during his tenure.

For his part, US President Donald Trump said that the statement of special investigator Robert Mueller does not come new to his own, considering that it is time to fold this page.

"There is no change in Muller's investigation, there is not enough evidence, and in this case, in our country, the person is innocent," he wrote in a tweet, published minutes after Muller said.