THE G20...BEHIND CLOSED DOORS

What's the G20? Thirty years ago, the G7 group of industrialized nations — the United States, Japan, Britain, France, Germany, Italy, and Canada — accounted for almost 70% of the global economy, giving them hefty international influence. But by 2008, that number had fallen to just over 50%, and when the global financial crisis hit, it was clear that big new players like China, India, and others had to be included in talks over how to avert disaster.

Enter the G20, which includes the G7 plus China, India, Brazil, Indonesia, Saudi Arabia, Turkey, Argentina, Australia, South Korea, South Africa, Russia, Mexico, and a representative of the European Union. This group now accounts for 80% of global GDP and two-thirds of the world's population.

What's the G20 good for? The G20 produced a unified response to the financial crisis, but only because it threatened all of these countries at the same time. Since then, the group hasn't accomplished much of anything that demands compromise and shared sacrifice. It's hard to get 20 negotiators to agree on anything, but particularly when key players like China, Russia, and Saudi Arabia don't have the same political or economic values as the US, the Europeans, and Japan.

So does this summit matter? Yes. Even if the full G20 summit meetingaccomplishes little else, the broader event will serve one very important purpose: it will give world leaders a chance to meet on the sidelines to talk through important questions in less formal settings. Not surprisingly, there are lots of people who want face-time with President Donald Trump.

The main event: The most anticipated moment of the Osaka summit is the expected Saturday meeting between Trump and China's President Xi Jinping. The US-China trade war continues, and finance officials and economistswarnthat it's beginning to undermine the entire global economy.

US Treasury Secretary Steve Mnuchin said this week that the two sides are 90% of the way to a deal, but China reportedly has a list of specific demands — including the lifting of US sanctions on Chinese tech giant Huawei — that they want met before anybody signs anything. Trump hasn't yet indicated how he feels about that.

In short, the world is watching and hoping for a trade war truce, if not a deal to end it altogether. We'll find out over the weekend whether things are moving in that direction.

The under card: That's not Trump's only noteworthy meeting. Click here for the full undercard of Trump meetings: Putin, Modi, Merkel, Erdogan, and breakfast with the Saudi Crown Prince!

Bottom line: You can ignore the choreographed group photos and empty joint statements, but the private meetings behind closed doors are genuinely important. That alone makes the G20 worth watching.

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Does Boris Johnson strengthen or weaken the US-UK relationship?

Well I mean strengthens it in so far as he and Trump like each other. They're both oriented towards Brexit. They're kind of right-wing populists that aren't ideologically moored. But will it last? Boris could flip on a dime on any major issue as can Trump. So it's kind of volatile. Plus they both really love the media and when they're in front of each other with other people the potential to - I mean Boris upsets people and Trump easily takes offense. So this could easily go south.

Will Iran release the captured UK oil tanker?

I mean over time I suspect it will. But remember the UK has an Iranian tanker as well, so it's much more likely they work these things out together even if they're not explicitly linked, than suddenly the Iranians say, "Oh I'm sorry. Here's your tanker"

Will protests continue in Hong Kong?

It certainly seems that way. The question is what will China do about it? Xi Jinping is now saying that they are reaching the danger zone and the ability of the Chinese to hit back and hit back hard is real. I worry about those protesters.

Will Robert Mueller reveal anything new when he testifies on Capitol Hill?

I highly doubt it. He said very clearly that he does not intend to go beyond what was in his report. So Democrats looking for bombshells on collusion or obstruction are likely to be disappointed.

Can President Trump expand his electoral college edge in 2020?

Well he thinks he can. He thinks he can win in places like Minnesota and New Hampshire. I think it's more likely that he just hangs on to the Rust Belt states like Pennsylvania, Michigan and Wisconsin that got him there in 2016.

Should the governor of Puerto Rico resign?

Absolutely. Governor Rossello should resign. He's lost the confidence of the island. Puerto Rico needs a fresh start particularly after all these terrible text messages. He should definitely resign.

Finally for The Rant: today's rant is on Elizabeth Warren who put out a report today saying the economy is on the brink of collapse. It was very alarmist, certainly there are problems with the economy. Issues that could be fixed but she risks sounding like she's yelling fire in a crowded theater with calls like that.

"A regime willing to kill en masse to stay in power,' Karim Sadjadpour, an expert on Iranian, discusses the challenges facing the rise of democracy within the country.

Avi Loeb, The Chair of Harvard University's Astronomy Department, delves into the search for extraterrestrial life.