Is GOP using McCain to set up impeachment? [View all]

Here is McCain's statement about the debacle today:

"What I was trying to get at was whether Mr. Comey believes that any of his interactions with the President rise to the level of obstruction of justice. In the case of Secretary Clinton’s emails, Mr. Comey was willing to step beyond his role as an investigator and state his belief about what ‘no reasonable prosecutor’ would conclude about the evidence. I wanted Mr. Comey to apply the same approach to the key question surrounding his interactions with President Trump — whether or not the President’s conduct constitutes obstruction of justice. While I missed an opportunity in today’s hearing, I still believe this question is important, and I intend to submit it in writing to Mr. Comey for the record.”
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They invited him in and gave him time. You would think they would have conferred. So why would he try to get Comey to commit to calling tRump's actions an obstruction of justice? Just what the hell is their game plan? Did they set up McCain as the patriot who would lead the GOP to call for impeachment?