Carlos Osorio / AP

Axios sat down with Rep. Fred Upton yesterday, the former Energy and Commerce Committee chairman who now leads the energy subcommittee. A few notes from our conversation in the Michigan Republican's office:

Upton revealed he may join the bipartisan Climate Solutions Caucus, which currently has 48 members split evenly between the parties.Why it matters: Membership from Upton would add stature to the group, given his longtime prominence on energy policy and seniority in GOP circles.Upton said Democrat Jan Schakowsky approached him this week about joining, and that he's "running the traps" on the idea. (Note: It's a "Noah's Ark" caucus with equal party representation, so members join in bipartisan pairs.)

Paris: Upton is "disappointed" that President Trump is abandoning the Paris climate accord. He noted that the agreement does not impose emissions mandates or penalties, and noted the provisions that improve monitoring of China's and India's emissions."I didn't think it was worth joining Syria and Nicaragua as being the only two other countries that were not signatories to it," he said.Go deeper: Upton was among the 46 Republicans who broke with most of their colleagues by voting last week to support new Defense Department's work to assess the national security threat of climate change.

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Photos: Brendan Smialowski/AFP via Getty Images; Jim Watson/AFP via Getty Images

Joe Biden twice referred to President Trump as "this guy," and Trump called the former vice president's family "like a vacuum cleaner" for foreign money.

Why it matters: The personal venom — during Thursday's final presidential debate, in Nashville — was a reminder that even during a more normal debate, nothing this year is normal.

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Illustration: Lazaro Gamio/Axios

A surprise offer from Vladimir Putin has the U.S. and Russia once again circling a potential pre-election nuclear deal.

The big picture: The last treaty constraining the U.S. and Russia, New START, is due to expire on Feb. 5, 2021, two weeks after the next U.S. presidential inauguration. For the first time since the height of the Cold War, the nuclear guardrails could come off.

The cliffhanger could be ... Georgia

Illustration: Sarah Grillo/Axios

It hasn't backed a Democrat for president since 1992, but Georgia's changing demographics may prove pivotal this year — not only to Trump v. Biden, but also to whether Democrats take control of the Senate.

Why it matters: If the fate of the Senate did hinge on Georgia, it might be January before we know the outcome. Meanwhile, voters' understanding of this power in the final days of the election could juice turnout enough to impact presidential results.