President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE’s core campaign promise to build a wall on the Mexican border is now the biggest sticking point in complicated negotiations with Congress to prevent a government shutdown.

Both sides are digging in ahead of a White House meeting on Tuesday aimed at narrowing the differences on immigration between the president and lawmakers of both parties.

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The reemergence of the border fight comes as Congress has less than two weeks to clinch a deal to fund the government and address a laundry list of other issues.

Trump is doubling down on the border wall being a condition for any deal to help people enrolled in the Deferred Action for Childhood Arrivals (DACA) program. He called the wall “desperately needed” during a retreat with GOP leadership over the weekend.

“We have to get rid of the lottery system, we have to get rid of chain migration, and we have to have a wall,” Trump said after the Camp David retreat.

Trump is planning to visit prototypes of the border wall in San Diego at the end of this month. The White House has asked Congress for $18 billion to build and repair roughly 700 miles of border structures.

Ahead of Tuesday’s meeting, the Department of Homeland Security sent a wide-ranging list of Trump’s immigration priorities to the senators working on a bipartisan DACA deal; the wall was at the top of the list.

The wish list also included tightening the rules for allowing unaccompanied minors to enter the country and new limits on which family members citizens and permanent residents can sponsor.

But Democrats are refusing to allow new funding for a border wall, and say Trump’s insistence on it increases the chances of a government shutdown next week.

“I will certainly vote against it, and I know most Democrats will vote against it,” Rep. Joaquin Castro Joaquin CastroHispanic Caucus members embark on 'virtual bus tour' with Biden campaign Hispanic caucus report takes stock of accomplishments with eye toward 2021 Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-Texas) told MSNBC on Sunday.

Democrats have been more receptive to increased funding for border security, which could include more technology and repairs to existing infrastructure — provisions they accepted as part of the 2017 omnibus spending bill Trump signed in May.

Republicans, meanwhile, are accusing Democrats of playing politics on immigration because of their opposition to Trump.

The Republican National Committee, in a note to reporters, said Democrats are “terrified of upsetting their militantly-liberal base” and “AWOL on the very policies they supported just a few years ago.”

While the Democrats had supported a host of new security provisions — including new wall funding — in a 2013 immigration package, that legislation was designed to overhaul the entire system, granting new legal protections to the 11 million immigrants living in the country illegally.

The DACA fix being discussed this month would affect only a sliver of the larger community, and the Democrats have rejected a package that would protect the “Dreamers” while cracking down on enforcement against the broader population of immigrants here illegally.

“A lot of these conditions are [a] non-starter,” Rep. Adriano Espaillat Adriano de Jesus Espaillat CabralHispanic Caucus members embark on 'virtual bus tour' with Biden campaign On the Money: Pelosi draws line at .2T | Jobless claims dip | Swing-state jobless numbers an issue for Trump Sharpton, police reform take center stage at National Mall MORE (D-N.Y.), the first formerly undocumented immigrant to be elected to Congress, said last week. “The wall is certainly a non-starter.”

Senate Minority Leader Charles Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE (D-N.Y.) called the White House list a series of “unreasonable demands entirely outside of the scope” of the negotiations.

“Over the past year the White House has much more frequently been a disruptive force rather than a unifying force. To throw down a list from the hard, hard-line wing of the White House at the last minute is not a very fortuitous or smart thing to do,” he said on Monday.

The Democrats will have plenty of leverage in the fight, empowered by the filibuster in the upper chamber, where Republican leaders will need at least nine Democratic votes to pass an omnibus bill funding the government.

House GOP leaders face their own hurdles because dozens of conservatives have traditionally opposed big spending packages, forcing party leaders to reach across the aisle to Rep. Nancy Pelosi Nancy PelosiPelosi: Ginsburg successor must uphold commitment to 'equality, opportunity and justice for all' Bipartisan praise pours in after Ginsburg's death Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (Calif.), the Democratic leader, for votes.

Those conservatives are already sounding alarms that they’ll oppose a government funding bill that adds to deficits or provides DACA protections without the tough immigration enforcement measures being pushed by Trump.

“Before an agreement is reached on the Deferred Action for Childhood Arrivals program, we need to increase border security, improve interior enforcement, end the diversity lottery program, end chain migration, and provide new funding for a physical wall on the southern border,” Rep. Mark Walker Bradley (Mark) Mark WalkerMike Johnson to run for vice chairman of House GOP conference The Hill's Morning Report - Sponsored by National Industries for the Blind - Woodward book revelations rock Washington The Hill's 12:30 Report — Presented by Facebook — Trump, Biden duel in final stretch | Vaccine trial on pause after recipient's 'potentially unexplained illness' | Biden visits Michigan | Trump campaign has 18 events in 11 states planned in the next week MORE (R-N.C.), chairman of the Republican Study Committee, wrote Monday in an op-ed for The Washington Examiner.

An agreement reached in May to fund the government through last September gave the administration $1.5 billion for border security. But Trump was furious that he didn’t get the new wall funding he’d demanded, suggesting afterwards that he’d risk “a good shutdown” to secure that victory in the future.