A federal judge on Thursday blocked the implementation of key parts of President Donald Trump’s executive order on mail voting, declaring the plans to intervene in state-run elections unconstitutional.

Trump’s March executive order directed the creation of federal lists of voters and asked the Postal Service to only deliver mail ballots to certain people on those lists.

The ruling to stop enforcing the executive order came from U.S. District Judge Indira Talwani in Boston, an appointee of former President Barack Obama.

The decision is a blow to Trump, though an expected one, ahead of this fall’s midterm elections. Election experts have said they anticipated the order would be blocked because the U.S. Constitution gives control over election administration to the states.

A separate ruling from a federal judge in Boston on Wednesday permanently barred Trump from implementing the first executive order he signed on elections in his second term. That order sought to require voters to show proof of citizenship when registering.