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At the White House yesterday, U.S. President Donald Trump hosted Palestinian Authority President Mahmoud Abbas. The focus: achieving peace in the Middle East between Israelis and Palestinians.

President Trump hosted Israel Prime Minister Benjamin Netanyahu here in mid-February. And after yesterday's meeting with President Abbas, the U.S. leader promised he'd help the two sides negotiate peace.

DONALD TRUMP, PRESIDENT OF THE UNITED STATES: The Palestinians and Israelis must work together to reach an agreement that allows both peoples to live, worship and thrive and prosper in peace. And I will do whatever is necessary to facilitate the agreement, to mediate, to arbitrate anything they'd like to do.

AZUZ: President Abbas welcomed President Trump's offer and the Palestinian leader said he had hope for a historic Middle East peace treaty with the assistance of the American president.

Several leaders from the U.S. and the Middle East have attempted and failed to do this over recent decades. So, some experts are skeptical about whether it will happen now. But they say this could set the stage for progress down the road.

For an agreement to be reached between Palestinians and Israelis, a number of challenges would have to be overcome. Some of them being the terms of a two-state solution.

SUBTITLE: Israel, Palestine: A two-state solution?

OREN LIEBERMANN, CNN CORRESPONDENT: The idea behind a two-state solution is an Israeli state next to a Palestinian state. Two states living side by side in peace and security. It's been the goal of virtually the entire international community for decades.

So, why hasn't it happened yet? Well, both sides blame each other.

But at the center of a two-state solution are some very sensitive and very complex issues. One of those issues is Jerusalem. Both sides claim all or part of the holy city as their capital.

But there are also more issues. Borders, where would you draw the line between an Israeli state and a Palestinian state? Settlements, what would you do with Israeli settlements in the West Bank? And refugees, what happens to the Palestinian refugees?

All of these are very sensitive issues that need to be discussed before a final two-state solution can be recognized.