House Oversight Committee Chairman Jason Chaffetz said he wants James Comey to testify on Capitol Hill, but he's having problems getting in touch with the fired ex-FBI head.

'His telephone number changed since he left government service,' Chaffetz told ABC's George Stephanopoulos Thursday morning. 'So I used to be able to text and call him. I do believe he has my telephone number, but I do hope to chat with him.'

Chaffetz said to comply with House rules he's already sent a date for Comey to come testify, next Wednesday at 9:30 a.m. EST.

Scroll down for video

CALL ME, COMEY? House Oversight Committee Chairman Jason Chaffetz told ABC's George Stephanopoulos he has no way to get in touch with the fired FBI Director James Comey

FBI Director James Comey was spotted leaving his house in the D.C. suburbs over the weekend. Chaffetz can't get ahold of Comey because he no longer has his digits

Stephanopoulos also asked Chaffetz about the more recent news of the day, the appointment of former FBI Director Robert Mueller to be a special counsel, tasked with overseeing the Russian investigation.

On Twitter Wednesday night, Chaffetz sang Mueller praises.

'Mueller is a great selection. Impeccable credentials. Should be widely accepted,' he wrote.

Though he explained to the ABC News man that he wasn't fully sold on the concept of a special counsel being appointed.

'Well, I don't know if a special counsel was warranted at this point,' he said Thursday morning. 'I have not seen the direct full evidence of an actual crime.'

'I do think Director Mueller is the best possible choice he could have made,' referencing Deputy Attorney General Rod Rosenstein, who made the pick.

As for the House's own investigation into Russian meddling in the presidential election and the tentacles touching the White House, Chaffetz said he'd like to see Comey's notes that said Trump had encouraged him to drop the investigation into former National Security Advisor Michael Flynn.

Chaffetz also said he was doubtful that Comey's notes actually existed, explaining 'nobody has seen them, even the reporter that did the story hasn't seen them.'

'We have asked the Department of Justice to see those documents, I've said if we need to subpoena them we'll subpoena them, but we really do need to see the full content of these materials and also talk to Director Comey,' Chaffetz said.

Stephanopoulos suggested that Mueller-led probe may prevent Comey from coming before Congress, which Chaffetz dismissed.

'That's hardly an excuse that's worked in the past and it's not going to work moving forward,' the Republican from Utah insisted.

Comey, he said, needed to speak to Congress, 'In the light of day, in a public setting.'

'Clearly, we're taking this very seriously,' Chaffetz added.