Approval of the way President Donald Trump is managing the government has dropped sharply since early in his second term, according to a new AP-NORC poll, with much of the rising discontent coming from fellow Republicans.

The survey from The Associated Press-NORC Center for Public Affairs Research was conducted after Democrats’ recent victories in off-year elections but before Congress took major steps to try to end the longest shutdown in U.S. history. It shows that only 33% of U.S. adults approve of the way the Republican president is managing the government, down from 43% in an AP-NORC poll from March.

That was driven in large part by a decline in approval among Republicans and independents. According to the survey, only about two-thirds of Republicans, 68%, said they approve of Trump’s government management, down from 81% in March. Independents’ approval dropped from 38% to 25%.

The results highlight the risks posed by the shutdown, which Trump and his administration have tried to pin squarely on Democrats, even as U.S. adults have cast blame on both parties as the funding lapse has snarled air traffic, left hundreds of thousands of federal workers without paychecks and comprised food aid for some of the most vulnerable Americans. But it could also indicate broader discontent with Trump’s other dramatic — and polarizing — changes to the federal government in recent months, including gutting agencies and directing waves of mass layoffs.

Even with the decline in support for his management of the government, Trump’s overall approval rating has remained steady in the new poll. About one-third of U.S. adults, 36%, approve of his overall handling of the presidency, roughly in line with 37% in an October AP-NORC poll. Approval of his handling of key issues like immigration and the economy have also barely changed since last month.