Shares of major health insurers slid Monday as investors reacted to a Senate deal that ended the 40-day U.S. government shutdown but failed to extend subsidies under the Affordable Care Act (ACA).The agreement delays the contentious issue until December, raising uncertainty for millions of Americans who depend on the subsidies to afford health coverage.Health insurance stocks are trading lower as markets weighed the political impasse's impact on the sector.On Sunday, Reuters cited Trump’s Truth Social post, ...