U.S. public approval of the war with Iran fell to its lowest level since the conflict’s early days, helping to hold President Donald Trump’s popularity at a record low, according to a Reuters/Ipsos poll that closed on Monday.

The four-day poll showed just 31% of Americans support U.S. military action against Iran, down from 37% in a March Reuters/Ipsos poll and 34% earlier this month. The decline was driven by fewer self-identified Republicans backing the conflict. Some 69% of Republican respondents support the war, compared with 77% in March.

The war has been dragging on Trump’s public standing this year, and for the second survey in a row just 33% of respondents said they approved of the Republican’s performance in the White House, the lowest level in polls from Trump’s first or second term.

Some 83% of the country thinks the war will go on “for an extended period of time,” the Reuters/Ipsos poll found, up from 80% earlier this month.

The poll surveyed 1,215 U.S. adults nationwide and had a margin of error of 3 percentage points in either direction.

(Reporting by Jason Lange in Washington; editing by Scott Malone and Deepa Babington)