JOHN MALCOLM - Vice President for the Institute for Constitutional Government / Heritage Foundation

Topic: Mueller's past ties to Comey

• Mueller's past ties to Comey makes Trump probe tricky, says ex-DOJ official

• Robert Mueller must tread carefully when investigating President Donald Trump because of his past ties to James Comey, former DOJ official John Malcolm told CNBC on Thursday.

• "Bob Mueller has an excellent reputation," Malcolm, former deputy assistant attorney general under the George W. Bush administration, said on "Squawk Box." "He's got to be a little bit careful because there is no question that he is close to Jim Comey. He dealt with him every day when Comey was deputy attorney general."