Signs are seen during the Virginia redistricting referendum on April 21 in Fairfax, Va. Julia Demaree Nikhinson/AP hide caption

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Julia Demaree Nikhinson/AP

The Supreme Court of Virginia on Friday struck down the congressional redistricting approved by voters in April . The ruling is a major setback for Democrats' attempt to counter the pro-GOP reshuffling of voting maps led by President Trump.

Commonwealth voters last month approved — by a 52% to 48% margin — a constitutional amendment to allow redistricting. But responding to a lawsuit brought by Republicans, the Virginia high court found that the Democratic-led legislature made procedural errors in how it placed the question on the ballot.

The majority opinion of the state Supreme Court found that the legislature violated the multistep process for putting constitutional amendments on the ballot and that the "constitutional violation incurably taints the resulting referendum vote and nullifies its legal efficacy."

"This violation…