washington two major u.s. health insurance group friday call senate republican leader mitch mcconnell drop healthcare bill provision propose senator ted cruz allow insurers offer stripped-down low-cost healthcare plan simply unworkable form would undermine protections pre-existing medical condition increase premiums lead widespread terminations coverage people currently enrol individual market america health insurance plan blue cross blue shield association say letter mcconnell senate democratic leader chuck schumer u.s. health insurers want cruz proposal drop senate bill