WASHINGTON — The Supreme Court is considering a Republican-led drive, backed by President Donald Trump’s administration, to overturn a quarter-century-old decision and erase limits on how much political parties can spend in coordination with candidates for Congress and president.

A day after the justices indicated they would overturn a 90-year-old decision limiting the president’s power to fire independent agency heads, the court on Tuesday is revisiting a 2001 decision that upheld a provision of federal election law that is more than 50 years old.

Democrats are calling on the court to uphold the law.

The limits stem from a desire to prevent large donors from skirting caps on individual contributions to a candidate by directing unlimited sums to the party, with the understanding that th

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