Monday on the NewsHour, the U.S. grapples with deadly temperatures as a heat wave grips the West and South. The U.S. ambassador to NATO discusses the future of the alliance and its potential expansion ahead of a crucial summit. Plus, the Supreme Court's decision on affirmative action sparks concerns over whether it could lead to fewer doctors of color and more racial bias in medicine. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders