White House says some employees were fired by mistake

Asked if he would consider withholding some of the billions in U.S. aid provided to Egypt and Jordan each year if they don’t agree to take in Palestinians from Gaza, Trump told reporters, "Yeah, maybe. Sure. Why not?"

"I mean, if they don't agree, if they don't agree, I would. I would conceivably withhold aid, yeah," Trump said during his Oval Office spray.

Trump was also asked whether Palestinians in the West Bank would be relocated under his plan.

"No, I assume they want to remain there," he said. "It's different. They're there. It's never been like what we're talking about with the Gaza Strip."

-ABC News' Sarah Kolinovsky

Among the executive orders Trump signed Monday evening included one related to the use of paper straws.

"Nobody really likes paper straws," Trump said while saying the order will ask federal departments and agencies to look at their existing procurement processes.

"These things don't work," he said of paper straws. "I've had them many times, and on occasion, they break, they explode. If something's hot, they don't last very long, like a matter of minutes, sometimes a matter of seconds. It's a ridiculous situation. So we're going back to plastics."

Tulsi Gabbard's nomination to serve as director of national intelligence cleared a key test vote in the Senate on Monday by a vote of 52-46.

All Republicans voted for Trump's pick while all Democrats voted against her, with Sens. John Fetterman, D-Penn., and Thom Tillis, R-N.C., absent for the vote.

Gabbard's final confirmation vote is expected to take place Tuesday night or early Wednesday morning, but the timing could slide. She is expected to be confirmed.

-ABC News' Allison Pecorin and Isabella Murray

Trump said he wants to see the remaining hostages in Gaza returned by "12 o'clock" Saturday or "hell is going to break out."

"I think it's an appropriate time," Trump said of the deadline during remarks from the Oval Office, noting that he was "speaking for myself, Israel can override it."

"But from myself, Saturday at 12 o'clock. And if they're not here, all hell is going to break out," he said.

His remarks come after Hamas delayed the next planned release of hostages, which had been scheduled for Saturday, accusing Israel of violating the ceasefire agreement.