Mexico's foreign minister Wednesday said it is unlikely a meeting this week between President Trump and Mexican President Enrique Peña Nieto will "resolve substantial differences."

Trump is expected to meet with Peña Nieto later this week at the Group of 20 summit in Germany.

"It will be an important meeting, but we have to put it in context and not have expectations that are unjustified," Mexican Foreign Minister Luis Videgaray told the Televisa television network, according to Reuters.

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"We don't expect to resolve substantial differences."

Videgaray said the meeting between the two leaders will last about 30 minutes and will cover issues including the North American Free Trade Agreement.

Trump's proposed wall along the U.S.-Mexico border is not on the agenda, Videgaray added.

The meeting this week will be the pair's first since Trump visited Mexico City last year during his presidential campaign.

The two leaders were supposed have met earlier this year in Washington after Trump's inauguration, but the session was canceled after a public spat over Trump's attempts to make Mexico pay for his proposed border wall.

At the G-20 summit, Trump will have meetings with other leaders including Russian President Vladimir Putin, U.K. Prime Minister Theresa May and German Chancellor Angela Merkel.