WASHINGTON — President Donald Trump declared Tuesday it's time to "let Obamacare fail" after the latest GOP health care plan crashed and burned in the Senate, a stunning failure for the president, Republican leader Mitch McConnell and a party that has vowed for years to abolish the law.In a head-spinning series of developments, rank-and-file Republican senators turned on McConnell and Trump for the third time in a row, denying the votes to move forward with a plan for a straight-up repeal of "Obamacare." This time, it was three GOP women — Susan Collins of Maine, Lisa Murkowski of Alaska, and Shelley Moore Capito of West Virginia — who delivered the death blow.All had been shut out of McConnell's initial all-male working group on health care.McConnell, who could afford to lose only two votes in the narrowly divided Senate, had turned to the repeal-only bill after his earlier repeal-and-replace measure was rejected on Monday. That had followed the failure of an earlier version of the bill last month.The successive defeats made clear that despite seven years of promises to repeal former President Barack Obama's Affordable Care Act, Republicans apparently cannot deliver.