Tuesday on the NewsHour, Donald Trump's win in Iowa solidifies his hold on the GOP and a tough road ahead for his Republican challengers. Israeli leaders increasingly disagree in public over the best path forward as the international community works to get more aid to Gaza. Plus, a law capping insulin prices brings relief for some people with diabetes but the cost remains high for others. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders