Monday on the NewsHour, floodwaters rage and dangerous heat waves grow worse, posing serious risks to millions of Americans. The end of a Russian grain deal with Ukraine raises fears about global food security. Plus, police are under new scrutiny for their use of Tasers, less lethal than firearms but a weapon that can still be deadly. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders