ST. LOUIS • The Missouri Republican Party has filed a complaint seeking an inquiry into late reporting by U.S. Sen. Claire McCaskill's campaign.

Earlier this month, the Kirkwood Democrat submitted thousands of pages of amended campaign reports, dating as far back as 2006, when she unseated Republican Jim Talent.

In a race where McCaskill spent about $11.6 million, her revised campaign reports show more than a quarter-million dollars each of previously unreported donations and spending.

Many of the unreported donations come from donations below $200 — the threshold for itemized disclosure. McCaskill has also acknowledged not properly reporting flights on her personal aircraft as in-kind contributions.

Her campaign has said that a tragedy in the final weeks of the campaign contributed to some of the reporting errors. McCaskill's compliance director was killed in a skydiving accident about three months before Election Day in 2006.

In a complaint to the Federal Election Commission made public Monday, the state GOP accuses McCaskill of being in "massive non-compliance" with campaign laws.

It is not unusual for candidates to amend their campaign reports — it would be hard to find a major campaign that did not revise their spending and contribution info.

However, the sheer volume of McCaskill's amendments is what's flummoxing the GOP. Rather than submit only the new contributions or expenditures, McCaskill has refiled entire reports, totaling hundreds of pages, making it difficult to determine what's been changed.

Democrats say that refiling entire reports actually offers more transparency; Republicans remain unconvinced.

"It's impossible to a compare a 1,600 page report, side-by-side," said Lloyd Smith, executive director of the state GOP. "McCaskill needs to stop playing games."

Smith added that "it may be legal," but it certainly is a "unique" reporting method for a candidate like McCaskill, who's made transparency and accountability touchstones of her political career.