The “big, beautiful powerful wall” that Donald Trump promised to build between the US and Mexico may turn out to be a comparatively humble fence — if Capitol Hill Republicans get their way.

Lawmakers are hatching a a proposal to install a double-layer fence across 2,000 miles of the nation’s Southern border, instead of building the structure which Trump proposed during the presidential campaign, Reuters reported.

The fence is seen as both more cost effective and realistic, a congressional aide and an official from the Department of Homeland Security, told the news service.

The proposal also includes an increase in border agents.

But the plan is likely to face stiff resistance from the newly elected president, who made border security and building a wall a key to his campaign rally.

“I will build a great wall — and nobody builds walls better than me, believe me –and I’ll build them very inexpensively. I will build a great, great wall on our southern border, and I will make Mexico pay for that wall. Mark my words,” Trump said in June 2015 when he announced for president.

Another key provision of Trump’s plan is to have Mexico pay for the wall.

The president-elect hasn’t laid out how he plans to get America’s neighbor to foot the bill, the president of Mexico offered his congratulations to the president-elect.

“I trust that Mexico and the United States will continue to strengthen their bonds of cooperation and mutual respect,” Mexican President Peña Nieto tweeted Wednesday.

Trump plans to meet with Nieto soon after taking office.

Senate Majority Leader Mitch McConnell told reporters Wednesday that border security was a priority “in whatever way is the most effective.”

With Post wires