WASHINGTON—Republican senators are making a mad dash to pass the GOP tax-and-spending megabill and send it to President Trump’s desk by July 4.Senate Republicans cleared the first procedural hurdle late Saturday by a 51-49 vote.

Many Republican senators dismissed the idea of overruling the Senate parliamentarian after she rejected key Medicaid provisions in Trump's tax and immigration bill Thursday, which dealt a blow to Republicans' plan to slash costs in the budget package.