President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s decision to lift the ban on U.S. companies selling products to Chinese telecommunications company Huawei is sparking pushback from lawmakers worried about the potential national security implications.

Trump at the Group of 20 (G-20) summit decided to ease his ban on the firm, announcing that “U.S. companies can sell their equipment to Huawei." He tried to allay any concerns, noting that "we're talking about equipment where there’s no great national security problem with it.”

The concession came as Trump and Chinese President Xi Jinping agreed to restart trade talks after a face-to-face meeting, with Trump also saying that China would resume purchases of American farm products.

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The announcement brought a sharp reaction from Capitol Hill.

“Huawei is one of few potent levers we have to make China play fair on trade," Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) said in a statement. "If President Trump backs off, as it appears he is doing, it will dramatically undercut our ability to change China’s unfair trade practices.”

Trump's announcement was a stark reversal from his previous policies toward Huawei.

The Commerce Department added Huawei to its “entity list” in May, a move often seen as a death sentence for foreign companies. U.S. companies are banned from doing business with those on the list.

But in the case of Huawei, the Commerce Department issued a 90-day extension for implementing the ban in order to give companies time to adjust. That extension is now halfway completed, with Huawei set to be added in mid-August.

Trump said in Japan that Huawei would not be taken off the entity list but added that “we are going to be supplying equipment from our companies.”

Trump also signed an executive order in May that banned telecommunications companies deemed a national security threat from doing business in the U.S.

Security issues posed by Huawei, which is considered by many to be under some degree of control by the Chinese government, were summed up by a report put out by the North Atlantic Treaty Organization’s (NATO) Cooperative Cyber Defense Center of Excellence (CCDCOE) earlier this year, which touched on the risks from Huawei to the development of fifth generation (5G) networks.

“Chinese companies are not only subsidised by the Chinese government but also legally compelled to work with its intelligence services,” the CCDCOE wrote. “Whether the risk of such collaboration is real or perceived, the fear remains that adopting 5G technology from Huawei would introduce a reliance on equipment which can be controlled by the Chinese intelligence services and the military in both peacetime and crisis.”

Huawei has stayed quiet after Trump's announcement, with many details still unclear.

A spokesperson for Huawei told The Hill on Monday that “we acknowledge President Trump’s comments related to Huawei over the weekend and have nothing further to add at this time.”

But Trump's decision has led lawmakers to voice bipartisan worries about the company and national security.

Sen. Tom Cotton Tom Bryant CottonThe Hill's 12:30 Report: Trump stokes fears over November election outcome The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Abortion stirs GOP tensions in Supreme Court fight MORE (R-Ark.) tweeted on Saturday that “Huawei is not only an arm of the Chinese Communist Party, but also a close partner of the People’s Liberation Army."

Senate Judiciary Committee Chairman Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) said on CBS's "Face the Nation" that “there will be a lot of pushback” from both sides of the aisle if Huawei is used as a concession in trade talks.

Graham’s committee held a hearing in May around the rollout of 5G, following which Graham told reporters that “until China stops being a communist dictatorship, we are not going to support working with a country that uses their technology.”

Sen. Mark Warner Mark Robert WarnerFBI director casts doubt on concerns over mail-in voting fraud Democrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits MORE (Va.), the top Democrat on the Senate Intelligence Committee, told The Hill last week that allowing U.S. companies to again do business with Huawei "would be a disaster.”

Warner added “we put the whole credibility of the American intelligence community trying to convince our allies about this national security threat. You know, I hope the President is able to get a trade deal, but that should not interfere or undermine our national security."

Warner’s comments were a reference to the U.S. government’s ongoing efforts to convince foreign allies to ban Huawei technologies from being used in their 5G networks.

According to Reuters, the United Kingdom in April decided to allow Huawei technologies in “non-core” 5G networks, though no official announcement has been made. The governments of France, Germany, and Belgium have also been involved in discussions around this topic.

Sen. Marco Rubio Marco Antonio RubioGOP lawmakers distance themselves from Trump comments on transfer of power McConnell pushes back on Trump: 'There will be an orderly transition' Graham vows GOP will accept election results after Trump comments MORE (R-Fla.), meanwhile, vowed to pass legislation to put Huawei back on the entity list if President Trump decides to remove it, tweeting that the bill “will pass with a large veto proof majority.”

Warner and Rubio teamed up last month in sending a letter to Secretary of State Mike Pompeo Michael (Mike) Richard PompeoPutin nominated for Nobel Peace Prize The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Pompeo accused of stumping for Trump ahead of election MORE and U.S. Trade Representative Robert Lighthizer Robert (Bob) Emmet LighthizerWhiskey, workers and friends caught in the trade dispute crossfire GOP senator warns quick vote on new NAFTA would be 'huge mistake' Pelosi casts doubt on USMCA deal in 2019 MORE to express their “deep concerns” over Trump potentially rolling back the blacklisting of Huawei in the pursuit of a trade deal with China.

“Despite the best efforts of our government to convince other countries to keep Huawei components out of their 5G infrastructure, our message is being undermined by concerns that we are not sincere,” Warner and Rubio wrote.

Larry Kudlow Larry KudlowMORE, the top White House economic advisor, tried to lessen the fears of Congress over President Trump’s announcement.

"We understand the huge risks regarding Huawei," Kudlow said Sunday on CBS’ Face the Nation.

“Anything to do with national security concerns will not receive a new license from the Commerce Department,” Kudlow said. “I think that’s very important. I think people have to understand that.”

Some experts outside the government are urging Congress not to rush to action.

A senior official with the Information Technology and Innovation Foundation, an independent think tank, said that congressional action around Huawei should be stalled until the full results of the China trade negotiations are revealed.

ITIF President Robert Atkinson said there was pressure on the administration to decouple the U.S. and China, In effect break ties between businesses in the two economies.

“The only way to slow China down, the decouplers argue, is to decouple: impose harm on Chinese tech companies with tariffs, export bans and other tools, while pressuring U.S. and other companies to withdraw production from China,” Atkinson said in a statement.

“If China proves unwilling to stop its predatory and unfair practices, maybe it will have to come to decoupling. But jumping to that conclusion before seeing if President Trump’s trade negotiations can work is premature,” he cautioned.

Mark Linscott, a senior fellow with The Atlantic Council and the former U.S. trade representative for South and Central Asian Affairs, described Trump’s announcement in a post by the Atlantic Council this weekend as “fairly predictable” and an effort to create "more space for negotiation.”

But it is unclear if Huawei's critics are willing to give Trump that room.

In an op-ed for The Hill last month, former House Intelligence Chairman Mike Rogers Michael (Mike) Dennis RogersDemocrats slam DHS chief for defying subpoena for testimony on worldwide threats Remembering 9/11 as we evaluate today's emerging threats Hillicon Valley: Tech CEOs brace for House grilling | Senate GOP faces backlash over election funds | Twitter limits Trump Jr.'s account MORE (R-Mich.) cautioned against Huawei being used as a “football” to throw around in trade negotiations.

“Huawei is a security national threat, full stop, and it needs to be treated as such,” Rogers wrote.