A handful of Senate Republicans is holding up a House-passed retirement tax package.

Individual senators disagree with the bipartisan measure to varying degrees.

House lawmakers overwhelmingly approved the Setting Every Community Up for Retirement Enhancement Act (H.R. 1994) on a 417-3 vote before leaving town for the Memorial Day recess. But Senate tax writers were unable to clinch unanimous consent in their politically charged chamber to send the bill to President Donald Trump’s desk.

Senate Finance Committee Chairman...