Trump set for crucial diplomatic test in 1st face-to-face with Putin

Election meddling not expected to play prominent role in Trump's Putin meeting

Speculation had been building for months about a potential face-to-face between the leaders, and on Tuesday the White House and the Kremlin confirmed the two presidents would have a "bilateral meeting" for the first time.

Moscow had already built on the anticipation by releasing an extensive, if predictable, "agenda" for what they called a "full-fledged, seated" meeting.

The official also expressed doubt that Russia’s meddling in the 2016 election would play a prominent part in the meeting, viewing it as a waste of time and "a loser of a topic." It's not clear, however, whether the topic will come up.

It’s a striking admission, considering the high-stakes nature of the meeting and Putin’s reputation to meticulously plan and prepare for potential scenarios that would show him having the upper-hand optically.

Here are the topics and stakes likely to have the heaviest weight during the meeting:

THE RUSSIA INVESTIGATION

The grey cloud hanging over the two leaders when they shake hands in Hamburg will no doubt be the ongoing investigations into Russian interference in the U.S. presidential election, as well as potential collusion with Trump campaign officials.

The administration’s reluctance to say whether Trump will confront Russia on its suspected election meddling is now contrasted with Trump’s statements today criticizing the Obama administration for not doing enough to punish Russia for its activities. In contrast, former President Obama has said he used his G-20 meeting with Putin in September 2016 to confront him on the hacking.

For Trump to let the meeting pass without raising the issue at all could earn him bipartisan scorn.

“If he doesn’t, he comes back here, I think, to a firestorm,” said Steven Pifer, a senior fellow at the Brookings Institution and former U.S. ambassador to Ukraine. “He’ll be criticized by the media, he’ll be criticized by people like me, he’ll be criticized by Congress.”

In his first overseas press conference today, Trump questioned the U.S. intelligence community's conclusion that Russia was solely responsible for meddling in the 2016 election.

"I think it was Russia, but I think it was probably other people and/or countries," Trump said alongside Polish president Andrzej Duda taking questions from reporters in Warsaw. "Nobody really knows for sure."

Democrats, including Senate Minority Leader Chuck Schumer and ranking member on the House Intelligence Committee, Rep. Adam Schiff, have already responded to Trump's remarks in Poland today.

"President Trump must have the courage to raise the issue of Russian interference in our elections directly with President Putin, otherwise the Kremlin will conclude he is too weak to stand up to them," Schiff said. "That would be a historic mistake, with damaging implications for our foreign policy for years to come."

SYRIA/UKRAINE

A senior administration official said issues pertaining to Ukraine and Syria are likely to dominate the meeting's agenda.

Today, Trump called out Russia directly in his address to the Polish people in the historic Krasinski Square.

"We urge Russia to cease its destabilizing activities in Ukraine and elsewhere and support for hostile regimes including Syria and Iran and to join the community of responsible nations in our fight against common enemies and defense of civilization itself," Trump said.

Meanwhile, Russia’s continued support for the Assad regime -- including April’s sarin gas attack in the town of Khan Sheikhoun -- led President Trump to acknowledge, after his orders to strike a Syrian airbase, that relations with Russia were "at an all-time low."

OUTSMARTING PUTIN/SANCTIONS?

In the event there’s consensus or compromise on an issue, Trump will be labeled by some as kowtowing to Putin’s demands.

"My concern about the meeting is that Vladimir Putin will come into that meeting extremely well prepared. I think that’s been the experience of President Clinton, President Bush, President Obama that this guy knows his briefs," the Brookings Institutions' Pifer said. "There’s a certain risk that President Putin could describe something that sounds really good, and President Trump will say yes before he fully understands some hidden downsides. And if the downsides are discovered afterwards and the deal falls apart within a couple of days that actually puts U.S.-Russia relations in a bigger hole."

And if there’s some sort of heated confrontation, it could further exacerbate tensions between the U.S. and Russia.

"There clearly are risks when you’ve got a foreign policy process as disorganized as it appears to be in this administration," said Jeffrey Rathke, deputy director of the Europe Program at Center for Strategic and International Studies. "There is a risk of making commitments in one -– in one field that could impinge on other interests that haven’t yet been fully discussed in an inter-agency process."

Foreign policy experts say it sets up a likely "no-win" situation in terms of the outcome of the meeting.

"Trump will be unable to move on U.S.-Russian relations, even if he would like to, because Russia’s policy remains toxic in U.S. domestic politics," Fyodor Lukyanov, chairman of the Council on Foreign and Defense Policy said. “His handshake with Putin, though, will no doubt cause another political tsunami in Washington, which will further undermine their prospects for interaction."

ABC News' Benjamin Siegel contributed to this report.

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