WASHINGTON (AP) — Nevada Republican Dean Heller became the fifth GOP senator to declare his opposition to the party's banner legislation to scuttle much of Barack Obama's health care overhaul on Friday, more than enough to sink the measure and deliver a stinging rebuke to President Donald Trump unless some of them can be brought aboard. Senate Majority Leader Mitch McConnell, R-Ky., has said he's willing to alter the measure to attract support, and next week promises plenty of back-room bargaining as he tries pushing a final package through his chamber. Facing unanimous Democratic opposition, McConnell can afford to lose just two of the 52 GOP senators and still prevail. Besides the five who've announced outright opposition, several other GOP senators — conservatives and moderates — have declined to commit to the new overhaul. The measure resembles legislation the House approved last month that the nonpartisan Congressional Budget Office said would mean 23 million additional uninsured people within a decade and that recent polling shows is viewed favorably by only around 1 in 4 Americans. Democrats hope to use those rules to erase some language from the bill, including a section barring consumers from using the measure's health care tax credits to buy insurance that covers abortions.