Special Counsel Robert Mueller concluded President Donald Trump did not collude with Russia during the 2016 campaign, according to a summary of the investigation's findings.

Attorney General William Barr sent a letter to Congress Sunday, revealing the Justice Department found no evidence of coordination with Russia and insufficient evidence that President Trump attempted to impede the investigation.

After more than two years of Democrats and the mainstream press alleging "collusion" between President Trump and Russia, the special counsel concluded not only that there was none, but no one associated with the campaign worked with Russia, "despite multiple offers from Russian-affiliated individuals to assist the Trump campaign."

"The Special Counsel's investigation did not find that the Trump campaign or anyone associated with it conspired or coordinated with Russia in its efforts to influence the 2016 U.S. presidential election," the letter states. "As the report states, ‘[T]he investigation did not establish that members of the Trump Campaign conspired or coordinated with the Russian government in its election interference activities.'"

The letter also stated no more indictments stemming from the investigation will be issued, refuting claims made by former CIA Director John Brennan earlier this month.

Mueller's team of 40 FBI agents, and 19 lawyers, which included former attorneys for the Clinton Foundation, issued 2,800 subpoenas, executed 500 search warrants, submitted 230 orders for communication records, and interviewed 500 witnesses, costing taxpayers at least $25 million. In the end, they found no incriminating evidence against the president.

Mueller did not draw a conclusion on obstruction of justice, stating, "while this report does not conclude that the President committed a crime, it also does not exonerate him." However, Attorney General Barr and Deputy Attorney General Rod Rosenstein concluded there was "not sufficient evidence to establish the President committed an obstruction-of-justice offense."

President Trump often complained about the investigation as a "witch hunt" and a "hoax," while the investigation persisted for two years.

Trump said Sunday he was vindicated by the special counsel.

"After a long look, after a long investigation, after so many people have been so badly hurt, after not looking at the other side where a lot of bad things happened, it was just announced there was no collusion with Russia," Trump said.

"It's a shame that our country had to go through this," the president continued. "This was an illegal takedown that failed and hopefully somebody is going to be looking at their other side."