Chairman of the House Judiciary Committee Rep. Jerry Nadler (D-NY) questions former Special Counsel Robert Mueller as he testifies about his report on Russian interference in the 2016 presidential election in the Rayburn House Office Building July 24, 2019 in Washington, DC.Win McNamee | Getty ImagesLeaders of the House Judiciary Committee requested documents from Amazon, Apple, Facebook and Google parent company Alphabet, the committee announced Friday.The committee requested executives’ emails related to competition matters and documents provided to U.S. and international regulators from the past 10 years related to the Clayton Act, which deals with reviewing potentially anticompetitive mergers, according to a press release. The request shows the committee is ramping up an antitrust review as federal regulators and attorneys general from 50 states and territories are prepping their own probes. Tech executives testified in front of the House Judiciary subcommittee on antitrust in July, but the subcommittee’s ranking member, Jim Sensenbrenner, R-Wis., said lawmakers still need more information. »I appreciate the willingness of certain tech companies to come before our committee and answer questions, » Sensenbrenner said in a statement. « However, we still need more information about their business practices at this fact-finding stage of this investigation. »This story is developing. Check back for updates.Subscribe to CNBC on YouTube.