House panel says big tech wields monopoly power

America’s biggest technology companies have leveraged their dominance to stamp out competition and stifle innovation, according to a Democratic-led House panel, which said Congress should consider forcing the tech giants to separate their dominant online platforms from other business lines.

The report released Tuesday from Democratic staff of the House Antitrust Subcommittee capped a 16-month inquiry into the market power of Amazon.com Inc., Facebook Inc., Alphabet Inc.’s Google and Apple Inc.

Republicans issued a separate response endorsing strong antitrust enforcement targeting the companies but didn’t endorse many of the Democrats’ policy prescriptions. It also accused the companies of bias against conservative viewpoints.