Congressional negotiators remain optimistic they can strike a bipartisan border security deal to avert the year's second government shutdown despite President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's threats to scrap the deal and declare a national emergency to build his proposed border wall.

A bipartisan, bicameral negotiating group tasked with finalizing a deal will meet behind closed doors on Wednesday for a briefing from border security experts.

Negotiations hinge on a series of technicalities and semantics. President Trump said he wants $5.7 billion for a concrete wall or steel slats. Senate Democrats had agreed to $1.6 billion in fencing last year, while House Democrats had opposed any sort of physical barrier until last week.

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But following a five-week shutdown, Democrats have indicated an openness to funding some physical barriers as part of a broader deal if experts testify that it is a cost effective measure.

“We’re not allergic to physical barrier,” said Rep. Pete Aguilar Peter (Pete) Ray AguilarRep. Robin Kelly enters race for Democratic caucus vice chair Pelosi seeks to put pressure on GOP in COVID-19 relief battle Races heat up for House leadership posts MORE (D-Calif.), one of the negotiators.

Rep. Kaye Granger (R-Texas), the ranking member of the House Appropriations Committee, said that the final number associated with a barrier would not only include new construction, but also repairs to existing sites and technology that helps border patrol apprehend people.

That could help Trump claim victory using a hefty figure associated with a barrier, while Democrats use a smaller figure denoting the amount spent on new physical structures alone.

Granger, who toured the border with a few other committee members on Sunday, said border security patrol professionals cited physical barriers as a top priority. But she also said that a concrete wall wasn’t the solution.

“There’s no one that came and said we should put a solid wall all across our southern border. We didn’t say a solid wall anywhere, that’s not the thing to do,” she said.

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Trump’s threats to abandon negotiations altogether in favor of a national emergency declaration have loomed over the talks.

“I don't take anything off the table. I don't like to take things off the table. It's that alternative. It's national emergency, it's other things and you know there have been plenty national emergencies called,” Trump told CBS News last week.

But sustained pushback from Republicans in Congress to an emergency declaration have boosted negotiators and focused them on striking a deal.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellGraham: GOP will confirm Trump's Supreme Court nominee before the election Trump puts Supreme Court fight at center of Ohio rally The Memo: Dems face balancing act on SCOTUS fight MORE (R-Ky.) said he had advised Trump on Congress’s power to overturn such a declaration, a vote that Speaker Nancy Pelosi Nancy PelosiTrump puts Supreme Court fight at center of Ohio rally CDC causes new storm by pulling coronavirus guidance Overnight Health Care: CDC pulls revised guidance on coronavirus | Government watchdog finds supply shortages are harming US response | As virus pummels US, Europe sees its own spike MORE (D-Calif.) could trigger in both chambers.

Others have publicly noted that lawsuits would quickly tie up an emergency declaration in court.

"It probably ends up in him not getting the result he wants, which is getting a wall build soon, not to mention the fact that it's going to occupy a lot of time up here because it's going to trigger a vote,” said Sen. John Thune John Randolph ThuneGraham: GOP will confirm Trump's Supreme Court nominee before the election Tumultuous court battle upends fight for Senate What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-S.D.), the Senate Majority Whip.

Negotiators are widely optimistic they can strike a deal by Friday, or possibly stretch out talks over the weekend, and still ensure their legislation would have time to pass both chambers by the February 15th deadlines.

"Hope springs eternal. We are legislators and conferees by nature. We'll try to put something together,” said Sen. Dick Durbin Richard (Dick) Joseph DurbinTumultuous court battle upends fight for Senate McConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden MORE (D-Ill.).

Failure to pass a bill, or a refusal by Trump to sign it, would lead to a new government shutdown just three weeks after the last one became the longest in the nation’s history.

So far, none of the negotiators have floated the possibility of needing a stop-gap measure to push off the deadline.

Whether Trump will ultimately endorse or veto a compromise bill, however, is anybody’s guess.

“I hope if there's a deal struck by the conference, the president would be willing to sign it,” said Thune.

“But I don't want to guarantee it."

Jordain Carney contributed to this report.