https://www.reuters.com/article/us-usa-tech-congress/big-tech-ceos-ready-defenses-for-u-s-congress-hearing-into-their-growing-power-idUSKCN24O16K >The chief executives of four of the largest U.S. tech companies plan to deflect criticism next week in a Congressional hearing into their use of market power to hurt rivals by saying they themselves face competition and by debunking claims they are so dominant.