Wednesday on the NewsHour, Big Tech executives are grilled by federal lawmakers, accusing them of failing to protect children online. Then, the U.S. blames a powerful Iran-backed militia in Iraq for the deadly attack on a U.S. base in Jordan as it prepares to strike back. Plus, a conservative critic of Donald Trump discusses what his possible renomination could mean for the GOP and the country. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders