Trump's promise that Mexico will pay for wall could be in trouble following budget proposal

The Trump administration released a preliminary 2018 budget proposal on Wednesday, and with it comes official details on how the new White House plans to pay for the controversial border wall.

According to the 2017 proposal, the wall will cost taxpayers $2 billion this year. The White House expects to spend $4.1 billion on the wall through 2018.

RELATED: President Trump's border wall reportedly facing hurdles

Trump promised throughout the 2016 campaign that not only will a wall on the Mexican-American border be built, but that Mexico would pay for it. The campaign promise evolved into a rallying cry of Trump's campaign events, with then presidential candidate Trump often leading attendees in a call-and-response chant.

Click through images of the wall already along the US-Mexico border:

30 PHOTOS
Where the wall already exists along the US-Mexico border
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Where the wall already exists along the US-Mexico border
A gap in the U.S.-Mexico border fence is seen outside Jacumba, California, United States, October 7, 2016. REUTERS/Mike Blake 
U.S. customs and border patrol officers inspect a vehicle entering the U.S. from Mexico at the border crossing in San Ysidro, California, United States, October 14, 2016. REUTERS/Mike Blake 
U.S. customs and border patrol officers inspect a vehicle entering the U.S. from Mexico at the border crossing in San Ysidro, California, United States, October 14, 2016. REUTERS/Mike Blake 
Men talk on a street in the town of Calexico, California, United States, October 8, 2016. REUTERS/Mike Blake 
A U.S. customs and border patrol officer stands at a border crossing in San Ysidro, California, United States, October 14, 2016. REUTERS/Mike Blake
Recent arrivals from Mexico wait to board a greyhound bus in San Ysidro, California, United States, October 14, 2016. REUTERS/Mike Blake
Highway 82 towards Douglas, Arizona is seen near Sonoita, Arizona, United States, October 10, 2016. REUTERS/Mike Blake 
Clouds float above the border towns of Nogales, Mexico and Nogales, Arizona, United States, October 9, 2016. REUTERS/Mike Blake 
A sign warning drivers that firearms and ammunition are prohibited in Mexico is seen at the U.S.-Mexico border in Nogales, Arizona, United States, October 9, 2016. REUTERS/Mike Blake
Buildings in Nogales, Mexico (R) are separated by a border fence from Nogales, Arizona, United Sates, October 9, 2016. REUTERS/Mike Blake
An abandoned car sits off the side of a road near Jacumba, California, United States, October 7, 2016. REUTERS/Mike Blake 
A worker makes his way through the water after setting up an irrigation system on an agricultural field, near Calexico, California, U.S. October 7, 2016. REUTERS/Mike Blake
An abandoned car sits off the side of a road near Jacumba, California, United States, October 7, 2016. REUTERS/Mike Blake 
A church at the Museum of History in Granite is seen in Felicity, California, United States, October 8, 2016. REUTERS/Mike Blake
A man drives a tractor plowing a field at sunrise near Calexico, California, United States, October 8, 2016. REUTERS/Mike Blake 
Residential homes are seen next to the fence that borders Mexico, in Douglas, Arizona, United States, October 10, 2016. REUTERS/Mike Blake
Pedestrians wait to cross the street in Calexico, California, Unites States, October 7, 2016. REUTERS/Mike Blake
The town of Bisbee is seen in Arizona, United States, October 10, 2016. REUTERS/Mike Blake
Pedestrians make their way into the the United States from Mexico at the pedestrian border in Nogales, Arizona, United States, October 9, 2016. REUTERS/Mike Blake
A roadside collection of alien dolls and toy UFO saucers is seen next to a roadside residence neat Jacumba, California, United States, October 7, 2016. REUTERS/Mike Blake
A road abruptly ends next to a sign for a cattle ranch near Douglas, Arizona, United States, October 10, 2016. REUTERS/Mike Blake
A boy rides an all-terrain vehicle next Mexican border along the Buttercup San Dunes in California, United States, October 8, 2016. REUTERS/Mike Blake
An old refurbished gas station is seen in Lowell, Arizona, United States, October 10, 2016. REUTERS/Mike Blake 
A man rides a tricycle past a grocery store in a town that borders Mexico, in San Luis Butter, California, United States, October 8, 2016. REUTERS/Mike Blake 
A U.S. customs and border patrol truck drives past the fence that marks the border between U.S. and Mexico, in Calexico, California, United States, October 8, 2016. REUTERS/Mike Blake
A truck drives west towards California along highway 8 near Gila Bend, Arizona, United States, October 10, 2016. REUTERS/Mike Blake
Electronic items are displayed in a shop window in Calexico, California, United States, October 7, 2016. REUTERS/Mike Blake 
A residential home is seen in Nogales, Arizona, United States, October 9, 2016. REUTERS/Mike Blake 
A fence separates the border towns of Nogales, Mexico (R) and Nogales, Arizona, United Sates, October 9, 2016. REUTERS/Mike Blake
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"Who's gonna pay for the wall?" Trump would ask before the crowd cheered "Mexico!"

Critics have already called Trump's new budget proposal the nail in the coffin for his border wall promise. However, the billionaire businessman's team has been pivoting since taking office regarding how Mexico will pay for the wall.

Calls for Mexico to pay for the wall have morphed into Mexico will reimburse America for the wall. Trump says that this pivot is out of urgency to get wall construction underway immediately.

"I don't feel like waiting a year or year and a half. We're going to start building. Mexico in some form and there are many different forms, will reimburse us and they will reimburse us for the cost of the wall. That will happen. Whether it's a tax or whether it's a payment," Trump said during a press conference back in January.

SEE ALSO: Senate Intelligence committee speaks out on Trump wiretapping

Recently, Republican leaders have grown more outspoken against the idea that Mexico will front the wall bill. "Uh, no," said Senate Majority Leader Mitch McConnell when asked if Mexico will pay for a southern border wall.

"I'm in favor of border security. There are probably some places along the border where that is probably not the best way to secure the border," McConnell added.

A Department of Homeland Security report estimated the cost of the wall would be $21.6 billion, far higher than the $12 billion estimate coming from Trump's team.

A Pew poll from February 2017 found 62 percent of Americans oppose building the wall and 35 favor the move.

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