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His achievements include the bipartisan VA reform bill: "Frankly, without him, I don't think we would have gotten it done."
Environmental groups say an array of provisions prevent them from backing the measure, touted as a bipartisan achievement.
There has been a 286 percent increase in overdose deaths since 2010.
Neither chamber wants to pass the other's bill, so a 60-day measure has emerged as a possible fallback.
The House majority leader says the Senate bill would be dead on arrival in the House, which is still set to leave town Thursday.
The House and Senate still need to agree on a highway bill and the fate of the Export-Import Bank before they can leave town for August.
The Senate is moving closer to approving a bill that includes an Ex-Im Bank renewal, which House GOP leaders strongly oppose.