According to sources working within the White House, close aides to Donald Trump are stumped on how the government will implement the president’s demand to close the U.S./Mexico border and are crossing their fingers he abandons the plan.

Axios is reporting that White House staffers and Homeland Security officials think Trump’s proposal is — in Axios’ words — “unworkable” when considering the fact that many Americans live in Mexico and cross the border each day for work.

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According to the report, “Administration officials privately say it’s unlikely Trump will follow through on his threat, and acknowledge that they’re nowhere near prepared to execute on such a radical plan on the president’s threatened timeline of this week.”

“The widespread view within the White House and at the Department of Homeland Security is that it’s a terrible and unworkable idea,” the report continues.

Nonetheless, aides are preparing for the worse in case Trump doesn’t back off, with one source stating, “It’s being looked into, what it could and would look like.”

You can read more here.