The Supreme Court on Monday turned down a request that it consider lifting a long-standing ban on corporations making direct contributions to political candidates.

Less than a week after finding unconstitutional a total limit on how much individuals can contribute to political candidates and parties, the justices without comment declined to review an Iowa law that bans contributions from corporations.

The challenge by Iowa Right to Life said the ban could not be reconciled with the court’s decision in Citizens United v. Federal Election Commission. That 2010 ruling said corporations and unions had a free speech right to unlimited spending on elections. But that decision did not touch on direct contributions to candidates.

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