In 4 paragraphs, give the background of the US government vs Huawei case, and insert in-text references in each paragraph.

The US government's case against Huawei began in earnest in 2012 when the House Intelligence Committee released a report warning against using Huawei and ZTE equipment, citing concerns about the companies' ties to the Chinese government (Riley, 2012). The report suggested that the Chinese government could use Huawei's equipment for spying, a claim that Huawei has consistently denied. The report also raised concerns about Huawei's alleged violations of US sanctions against Iran.

In 2018, the situation escalated when the US government banned federal agencies from using Huawei equipment, citing national security concerns (Sanger & Perlroth, 2018). The ban was part of a broader effort by the Trump administration to limit China's influence and access to the US market. The move was seen as a significant blow to Huawei, which had been making efforts to expand its presence in the US market.

In 2019, the US Department of Justice filed criminal charges against Huawei, including allegations of theft of trade secrets, obstruction of justice, and fraud (Swanson, 2019). The charges were related to Huawei's alleged theft of technology from T-Mobile, as well as its alleged violations of US sanctions against Iran. Huawei denied the charges, calling them "unfair" and "immoral."

The case took another turn in 2020 when the US government imposed further restrictions on Huawei, limiting its ability to purchase semiconductors and other components from US companies (Strumpf, 2020). The move was seen as a significant escalation in the US government's campaign against Huawei, potentially threatening the company's survival. Huawei criticized the move, saying it would "inevitably" harm the interests of US companies.

References: Riley, M. (2012). House Intelligence Committee Report On Huawei, ZTE. Bloomberg. Sanger, D. E., & Perlroth, N. (2018). U.S. to Limit Some Chinese Visas. The New York Times. Swanson, A. (2019). U.S. Charges Chinese Telecom Giant Huawei, Ratcheting Up Tensions With Beijing. The New York Times. Strumpf, D. (2020). U.S. Tightens Rules on China’s Huawei, Further Choking Off Its Access to Semiconductors. The Wall Street Journal.