Joe Biden’s lead among Catholics in swing states is within the margin of error after President Trump nominated Judge Amy Coney Barrett to the Supreme Court.

Biden, a Catholic, has consistently led Trump with fellow members of his faith throughout the campaign. But the Democratic presidential nominee now only boasts a slim advantage over the president in the Rust Belt states of Pennsylvania, Michigan, and Wisconsin, as well as Arizona, Florida, and North Carolina, according to a poll conducted by RealClear Opinion Research. That narrowing coincided with Trump’s nomination of Barrett to the Supreme Court, a move met widely with approval from Catholics.