Originally published Wednesday, February 6, 2019 at 03:44p.m.

WASHINGTON — The Senate's top Republican on Tuesday pushed congressional bargainers to reach a border security deal without first getting President Donald Trump's approval, a month after the impulsive president scuttled an apparent bipartisan deal and triggered a historically long federal shutdown.

Capitol Hill talks to resolve an impasse over Trump's demands for billions of dollars for his long-sought border wall were making progress, participants said. But with lawmakers facing a deadline to complete their work by Feb. 15 or confront a renewed shutdown, Senate Majority Leader Mitch McConnell, R-Ky., said he's not seeking Trump's blessing in advance.

McConnell's tactic could remove a significant hurdle confronting the talks. Trump's demands have shifted abruptly on several issues during his two years in the White House, and top Republicans seem to feel that the best course will be for them to focus on reaching a compromise with Democrats.

McConnell told reporters that negotiators "ought to reach an agreement, and then we'll hope that the president finds it worth signing."

That's a break from his stance during the recent 35-day partial federal shutdown, which began after Trump — under pressure from conservative pundits — turned against an agreement to keep agencies open that both parties thought he'd embraced. That closure ended Jan. 25, and during it McConnell insisted that Trump's buy-in would be needed before any agreement could be reached.

Trump is seeking $5.7 billion for a U.S.-Mexico border wall, but it's clear that the House-Senate negotiations won't approve nearly that much. The Senate put a $1.6 billion plan on the table last year, though many House liberals think even that amount is too high.

In his State of the Union address, Trump said he wanted to strike a border security "compromise" but emphasized that a "physical barrier, or wall" must be included. "I will get it built," he said.

At the same time, negotiators on the House-Senate panel sounded increasingly optimistic of reaching an agreement. The lead Senate GOP negotiator, Richard Shelby of Alabama, said he had a good conversation with House Speaker Nancy Pelosi and that staff is making progress in behind-the-scenes talks.

"Both sides have moved," Sen. Roy Blunt, R-Mo., said. "And hopefully we're going to continue to see movement."

But if Tuesday's developments increase the likelihood of an agreement among the pragmatic lawmakers dominating the talks — who are drawn from the deal-making appropriations committees — it could increase the risk that Trump might scuttle the entire effort if he's not satisfied with the border-security package.

Meanwhile, negotiators are leaning on border-security experts to sort through their options. While Trump is insisting on physical structures like walls, fences and vehicular barriers, Democrats are focused more on next-generation scanners, additional manpower and help for detained migrants.

"We're looking to see if there's a way to get together in a comprehensive way — whether it's a barrier, whether it's a fence, whether it's technology, whether it's more personnel. I think it might be all of that," Shelby told reporters.

A group of House GOP lawmakers returned from a fact-finding trip to Texas, New Mexico and San Diego. Rep. Chuck Fleischmann, R-Tenn., said he came away from the trip with a better sense of what approaches work best in varied locations, but that fences or walls are a key piece of the border security puzzle.

"The wall deters people, and it buys the agents time," Fleischmann said.

Texas Rep. Kay Granger, top Republican on the House Appropriations Committee, was also on the trip said it "absolutely" strengthened her conviction that physical barriers must be part of any agreement. She said the types of barriers that seem to work best — tall steel slats called "bollards" topped by concrete or steel — most resemble fences, not the walls Trump has demanded.

"That's not my problem. I would call it a fence," Granger told reporters.

She said she thinks a bipartisan agreement is "doable" and added, "I don't want another shutdown."

Hanging over the talks is a threat by Trump to label the situation on the southern border a national emergency and invoke powers to transfer money from other portions of the budget — like disaster aid intended for Army Corps of Engineers flood control projects — to his wall project.

Trump's address omitted any references to a renewed government shutdown or his oft-repeated threat to declare a national emergency if Congress fails to craft a deal he supports.

Invoking these emergency powers is already sparking a backlash among lawmakers, including many Republicans.

McConnell acknowledged Tuesday that he alerted Trump that both the Democratic-controlled House and the GOP Senate could move swiftly to block an emergency declaration, raising the chances that Trump would have to issue his first veto. McConnell opposes the idea of Trump building the wall by executive fiat but declined Tuesday to say whether he would vote for a resolution to try to overrule him.

GOP senators have said that the Senate, which Republicans control 53-47, could well have enough votes to initially block an emergency declaration. Many think there would not be the two-thirds House and Senate majorities needed to override a veto.

Democrats said McConnell's declaration was a good indication for an agreement.

"Every time we leave it up to the conferees, Democrat and Republican, House and Senate, we've been able to come up with a good agreement. It's when the president interferes that there's a problem," said Senate Minority Leader Chuck Schumer, D-N.Y.