President Trump on Thursday reacted to the appointment of a special counsel to investigate Russia's attempted interference in the 2016 election by saying there was "no collusion."

"Well, I respect the move, but the entire thing has been a witch hunt," Trump said during a joint press conference with President Juan Manuel Santos of Colombia.

"There was no collusion, and everybody — even my enemies have said there is no collusion," Trump added.

Trump argued the appointment of a special counsel "divides the country."

"I think we have a very divided country because of that, and many other things," Trump said. "So I can tell you that we want to bring this great country of ours together."

On Wednesday, Deputy Attorney General Rod Rosenstein announced the appointment of former FBI Director Robert Mueller to serve as special counsel to "oversee the previously-confirmed FBI investigation of Russian government efforts to influence the 2016 presidential election and related matters."

Earlier Thursday, Trump told television anchors during a lunch that the appointment "hurts our country terribly."

He also tweeted Thursday: "This is the single greatest witch hunt of a politician in American history!"