President Joe Biden’s job approval rating among Democrats has tumbled 11 percentage points in the past month to 75%, the worst reading of his presidency from his own party. This drop has pushed his overall approval rating down four points to 37%, matching his personal low.

At the same time, Biden’s approval among independents has declined four points, to 35%, while Republicans’ rating remains unchanged, at just 5%.

After ranging from 49% to 57% during the first eight months of his presidency, Biden’s approval rating has been mired in the low 40s for much of the past two years. Including the latest 37% job rating and an identical reading in April, Biden’s approval has fallen below 40% four times in the 33 readings Gallup has taken since he took office.