President Donald Trump, during a whirlwind 12 hours in the Middle East on Monday, celebrated a "new dawn" for the region as the first phase of a ceasefire deal he helped broker between Israel and Hamas got underway.

But as he returned to Washington, Trump faced tough questions on what comes next.

One key issue on ensuring a long-lasting peace is the disarmament of Hamas , as called for in Trump's 20-point peace plan but not explicitly handled in the initial phase of the agreement.

ABC News White House Correspondent Karen Travers asked Trump at the White House on Tuesday how long it would take Hamas to do so and if he could guarantee it would happen.

"Well, they're going to disarm, and because they said they were going to disarm. And if they don't disarm, we will disarm them," T

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