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McCain declined to divulge the substance of his questions, saying it was a matter between him and the nominee. But he brushed off the idea that it’s a personal grudge, given that Lighthizer wrote a mildly critical newspaper column in 2008 that said McCain’s support of free trade didn’t prove he was conservative.

McCain said his questions involve basic trade policy.

“It has a lot to do with whether a trade representative is for free trade or not. Or whether they want to be further isolationists and destroy our economy,” McCain said Tuesday on Capitol Hill.

“I’m not saying I’m opposing him. I want answers to the questions. That’s what senators do. That’s the right of a senator. It’s normal. It’s what we do every day.”

On NAFTA, some people are feeling pressure from the clock. With the Mexican election approaching and the U.S. midterms elections shortly thereafter, both the Mexican and American administrations have said they want a deal before mid-2018.

Failure to get a deal within a few months could delay the process into 2019. That’s why Trump and his commerce secretary have expressed increasing frustration with Congress in recent days, urging it to get going.

A senior senate staffer insisted Lighthizer’s confirmation is a fait accompli — it’s just a matter of timing: “He’s gonna get confirmed. The leader (Mitch McConnell) hasn’t scheduled it yet.” He said it could happen any day, although that’s been the standard position for a while.