With 10 days to go until a deadline for President Donald Trump to decide whether to keep the United States in the Iranian nuclear agreement, public backing for the deal matched a record high in a nationwide poll that also shows net support at its highest level.

A Morning Consult/Politico survey — conducted online April 26 to May 1 among 1,991 registered voters — shows 56 percent of respondents back the agreement reached in 2015 between former President Barack Obama, Iranian leaders and the heads of five other countries and the European Union to lift economic sanctions against Iran in exchange for its pledge to halt efforts to develop nuclear weapons. That matches a previous high from an April 2017 poll.

Net public support is at a record level — 30 percentage points — in the most recent survey. The share of voters opposing the deal — 26 percent — is at the lowest point since Morning Consult began tracking the topic in August 2015.