The largest U.S. cloud and artificial-intelligence companies have mounted one of the most concentrated Washington lobbying campaigns in a decade this week, scrambling to blunt a proposed federal moratorium on new frontier-scale AI training runs days before the Senate is scheduled to begin its decisive series of floor votes.

Executives and government-affairs teams from Microsoft, Alphabet, Amazon, Meta, Nvidia, Oracle and OpenAI held more than 90 meetings with senators and House members between Monday and Thursday, according to disclosure filings reviewed by congressional staff and a tally compiled by the Center for Responsive Politics. The companies have also recruited utilities, building-trades unions and several Democratic governors of data-center-heavy states to argue against the bill introduced last week by Sen. Bernie Sanders, I-Vt., and Rep. Alexandria Ocasio-Cortez, D-N.Y.

The legislation would impose a 24-month pause on training any AI system above a defined compute threshold, freeze new data-center interconnection approvals over 200 megawatts and require federal licensing of frontier models. A first procedural vote in the Senate is expected as soon as Tuesday, with full passage anticipated by April 7 if the coalition behind it holds.

“This isn’t a debate about whether to regulate, it’s a debate about whether to stop,” said Karim Doshi, senior vice president for policy at the Information Technology Industry Council, after a Wednesday meeting with moderate Senate Democrats. “A two-year freeze on the only American technology that’s outpacing China would be an unforced strategic error, and the senators we talked to today understand that.”

Sanders aides dismissed the industry blitz as predictable. “Every time Congress tries to put guardrails on a trillion-dollar industry, the lobbyists arrive in jets,” said Maya Friedrichs, the senator’s communications director. “The grid is buckling, water tables are dropping in Arizona, and these companies are racing to build models nobody asked them to build. The senator isn’t moved.”

The bill’s prospects have shifted noticeably during the war in the Middle East. With Brent crude still above $115 a barrel after Tuesday’s OPEC+ output decision and U.S. electricity wholesale prices up sharply in PJM and ERCOT, several centrist Democrats who had been undecided last week told reporters they were now leaning toward the moratorium. Sen. John Hickenlooper, D-Colo., said in a brief Capitol hallway exchange Wednesday that “the energy math has changed” and that he wanted to see the markup language before committing.

Industry’s counter-offer, circulated late Wednesday in a four-page memo from the newly formed American AI Coalition, would replace the training pause with mandatory pre-deployment safety evaluations at the National Institute of Standards and Technology, a binding interconnect-queue reform package and a $40 billion private commitment to nuclear and geothermal generation over five years. The memo, signed by chief executives of nine companies, also proposes a voluntary cap on training-run energy use through the end of 2027.

“We are not asking Congress to do nothing,” Microsoft President Brad Smith told reporters outside the Russell Senate Office Building on Thursday afternoon. “We are asking Congress to regulate the risks that actually exist, not the risks in a movie script. A moratorium tells every researcher in this country to move to London or Abu Dhabi.”

Alphabet chief executive Sundar Pichai, Nvidia chief executive Jensen Huang and OpenAI chief executive Sam Altman each held closed-door meetings Thursday with Senate Majority Leader John Thune and a rotating group of Republican holdouts. Three Republican senators — two from states with major data-center projects and one from a state with significant AI research universities — are believed to be the swing votes that determine whether the bill clears 50 in the Senate.

Opposition to the industry push is not limited to the Sanders-Ocasio-Cortez camp. The Communications Workers of America and the Service Employees International Union, both of which represent a growing share of data-center construction and operations workers, broke with the building-trades unions Thursday and endorsed the moratorium, citing safety conditions at recent hyperscale builds in Georgia and Louisiana. A coalition of evangelical and Catholic organizations, organized through the Faith and Technology Project, released a joint letter Thursday morning urging a pause.

Wall Street has so far treated the standoff as a manageable political event rather than a structural risk. Shares of Nvidia closed up 1.4% on Thursday, while a Bloomberg index of large-cap AI suppliers gained 0.6%. “The market’s read is that something passes, but not the original bill,” said Priya Venkatesh, a senior software analyst at Wedbush. “A NIST-led safety regime with energy strings attached is the most likely landing zone, and that’s already priced in for the hyperscalers.”

White House officials have remained publicly noncommittal. Press Secretary Karoline Leavitt, asked Thursday whether President Donald Trump would veto a moratorium if it reached his desk, said the administration was “watching the legislative process” and wanted to see a final text. Inside the West Wing, a senior administration official said on condition of anonymity, the debate has split between an economic-policy faction that views the bill as a brake on a critical U.S. industry and a populist faction sympathetic to its grid-and-water arguments.

For Capitol Hill veterans, the scale of the corporate response is itself a tell. “I’ve watched the telecom fights, the financial-reform fights, the platform-liability fights,” said Theodore Lampke, a longtime tech-policy lobbyist now at the consultancy Hawthorn Strategies. “I have never seen this many CEOs in this town in this short a window. They are taking it seriously because they think it can pass.”

Hearings before the Senate Commerce and Energy committees are scheduled to run through Monday, with markup expected Tuesday morning. Aides on both sides said additional amendments — including a possible carve-out for academic and open-source models below a defined parameter count — would be circulated over the weekend.