Apple, Google, Amazon and Facebook have all been asked to send a representative to speak to the House Judiciary Subcommittee on Antitrust on July 27.
The meeting was actually supposed to be staged at an earlier date, but the coronavirus pandemic derailed those plans, and it has therefore been delayed until the end of the month.
Among the big names set to appear at the meeting are Amazon's Jeff Bezos and Apple's Tim Cook.
Last month, meanwhile, Amazon announced it was set to invest $2 billion in green tech.
The Seattle-based firm said the Climate Pledge Fund will provide entrepreneurs and innovators with the money they need to create sustainable and environmentally-friendly tech.
Bezos said: "The Climate Pledge Fund will look to invest in the visionary entrepreneurs and innovators who are building products and services to help companies reduce their carbon impact and operate more sustainably.
"Companies from around the world of all sizes and stages will be considered, from pre-product startups to well-established enterprises.
"Each prospective investment will be judged on its potential to accelerate the path to zero carbon and help protect the planet for future generations."