WASHINGTON—President Biden’s political standing is at its weakest point of his presidency, a new Wall Street Journal poll finds, with voters giving him his lowest job-performance marks and favoring Donald Trump for the first time in a head-to-head test of the likely 2024 presidential matchup.

Biden lags behind Trump by 4 percentage points, 47% to 43%, on a hypothetical ballot with only those two candidates. Trump’s lead expands to 6 points, 37% to 31%, when five potential third-party and independent candidates are added to the mix. They take a combined 17% support, with Democrat-turned-independent Robert F. Kennedy Jr. drawing the most, at 8%.

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