WASHINGTON, D.C. -- Former FBI Director Robert Mueller is leading the investigation into possible collusion between the Trump campaign and Russia. Chris Swecker is now retired from the FBI, but he says his former boss is the best person to lead this investigation.

"He is all about the business of investigating, being fair, but thorough," Swecker asserted. "He's going to go where the facts lead him," he declared.

Swecker served as Assistant Director of the FBI Criminal Investigations Division under Mueller. Mueller has been appointed special counsel by Deputy Attorney General Rod Rosenstein. Mueller, a highly decorated retired Marine, a former prosecutor and the second-longest-serving director of the FBI. He led the agency under the Bush and Obama administrations, taking the position a week before 9-11.

His appointment has garnered praise from both sides of the aisle.

"He will have independent reign, he will have his own resources he will have his own space and he will have no one supervising him on a daily basis," Swecker explained. "No one is going to influence this investigation, he has nothing to prove," he said.

Mueller leads this investigation on the heels of the abrupt dismissal of his successor, James Comey. President Trump fired Comey as FBI Director earlier this month. Swecker says his termination came as a surprise to him.

"He was here a month ago and he sure didn't talk to somebody who thought he would get fired," he said.

Swecker says Comey made several missteps during his tenure as FBI director. He says he should have resigned sooner for the good of the agency, however, he doesn't doubt Comey's thoroughness as an investigator.

"He's a man of integrity and if he wrote in a memo that something happened, it happened, I believe that 100 percent," he declared.

In a joint press conference with Colombia's President Juan Manuel Santos, President Trump said, "while I respect the move, the entire thing has been a witch hunt, I think it divides the country, I think we have a very divided country because of that and other things."

He went on to say, "believe me there's no collusion, Russia is fine. my total priority is the United States of America."