US midterms: What a Democratic Congress could mean for AI giants like Nvidia, Microsoft, Google, and Meta

The US midterm election results could bring greater regulatory scrutiny for some of the world's biggest artificial intelligence (AI) companies as Democrats regain control of the Senate.

For technology giants such as Nvidia, Microsoft, and Google, the immediate concern may not be a sudden change in regulation but more investigations, questions over tax benefits, and pressure to address the impact of AI infrastructure on local communities.

Higher Scrutiny

Democrats have already indicated that data-centre taxation and public concerns around artificial intelligence will be among their investigative priorities. Daniel Goshorn, chief investigative counsel for Democrats on the Senate Finance Committee, told Reuters that the party planned to examine these issues if it regained control of the chamber.

A Reuters poll in October revealed that 69% of Democratic registered voters back limits on building data centers, compared with 43% of Republicans.

Higher Taxes on Data Centres

The expansion of artificial intelligence infrastructure, particularly data centres, has emerged as an important political issue in the US. Concerns over rising electricity bills, water consumption, and the environmental impact of these facilities have prompted lawmakers to question whether technology companies should bear a larger share of the costs.

Ron Wyden, a ranking Member of the Senate Finance Committee, recently unveiled a plan to raise taxes on data centres and restrict their business tax benefits, including investment-related benefits. He proposed taxes on a range of data-centre services, including data storage, cloud services, AI training, inference services, and high-volume data processing. The bill would allow exceptions for internet infrastructure and traditional IT departments.

A Democratic-controlled Senate could give lawmakers greater scope to expand these investigations.

What analysts say?

Market participants also see the possibility of a slowdown in AI infrastructure investment under a Democratic-controlled Senate. Tapas Strickland, chief market strategist at Moomoo ANZ in Sydney, told Reuters that the pace of AI data-centre expansion could slow, particularly in Texas, as policymakers assess their approach to the industry. He pointed to Texas and Georgia, which he said account for about a third of US AI data-centre spending and projects, and argued that Democratic victories in both states' gubernatorial races could affect the pace of expansion.

Jake Dollarhide, chief executive of Longbow Asset Management, told Reuters that a Democratic sweep of Congress could increase regulatory pressure on technology companies, particularly those involved in AI. In his view, this could moderate the rapid growth in the AI sector.

Past investigations into AI giants

Nvidia, Meta, Microsoft, and Google have significant AI exposure. Microsoft's exposure to AI comes through its Azure cloud business, its partnership with OpenAI, and the integration of AI into products such as Microsoft 365. In the September 2026 quarter, Azure revenue grew 48% year-on-year to $33.17 billion, while Microsoft Cloud revenue rose 30% to $63.9 billion. Microsoft has faced scrutiny over its AI partnerships in the past. In April 2025, Democratic senators Elizabeth Warren and Ron Wyden questioned its partnership with OpenAI, seeking details about investment arrangements, access to technology, and their potential impact on competition. The Federal Trade Commission (FTC) had also examined partnerships between Microsoft and OpenAI.

In the September 2026 quarter, Google Cloud revenue more than doubled year-on-year to $30.7 billion, while Search and other revenue stood at approximately $63.35 billion. Its Gemini app had also reached one billion users, according to Alphabet's quarterly results. Google has faced scrutiny over both its AI partnerships and its market position. In April 2025, Warren and Wyden questioned its partnership with Anthropic, seeking information about investment arrangements and potential competition concerns. Separately, the US Justice Department pursued antitrust cases against Google over its search and advertising technology businesses.

For Nvidia, its Data Centre business generated $89 billion in revenue in the quarter ended July 26, 2026, up 117% year-on-year and accounting for more than 92% of its total revenue of $96.2 billion. In 2024, the US Department of Justice began examining its dominant position in AI chips and its business practices. More recently, in February 2026, Democratic senators Warren, Wyden and Richard Blumenthal urged federal regulators to investigate Nvidia's $20 billion licensing deal involving Groq's AI chip technology and the hiring of its executives and employees.

Meta's data-centre investments have already attracted congressional scrutiny. On 14 October, Senator Ron Wyden, along with six other Democratic senators, questioned CEO Mark Zuckerberg over the company's use of federal research and development tax credits to fund its AI data-centre expansion. The senators said Meta's claimed R&D tax credits had increased from $700 million in 2023 to $4 billion in 2025 and sought an explanation of how the company qualified its data-centre spending for these credits.