It is expected to postpone a confrontation between the US government and the four great technology giants: Amazon, Apple, Facebook and Google.
The audience had to question the dominance of companies in their fields of e-commerce, smartphone software, social media and search.
It is expected to be delayed to allow politicians to attend a service for the late civil rights activist and congressman John Lewis.
A new date has yet to be confirmed.
The development was first reported by Protocol and Reuters, and then confirmed by the FT.
Mark Zuckerberg of Facebook, Sundar Pichai of Google, Jeff Bezos of Amazon and Tim Cook of Apple were due to appear by video link before the antitrust panel of the judicial committee of the House of Representatives.
The meeting would have been the culmination of a year of research on companies.
The panel is ready to publish a report recommending whether legislation is needed to end the dominance of companies in their respective sectors.