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National Park Service officials initially hoped to complete the work earlier this year, prior to the start of the summer tourist season, but scheduling issues pushed the timeline back.

Critics of the paraphrased quote called on the Park Service and memorial foundation to fix or remove the inscription for more than a year, but officials said the coordination of six sculptors’ schedules as well as that of contractors proved to be the biggest hurdle.

Mr. Lei, who is expected to arrive in the District the week of July 29, will remove the quote by carving a series of ridges and linear marks atop the quotation.

National Park Service officials said the fix is expected to cost about $700,000 and is being paid for through a maintenance fund supplied by private donations specifically for commemorative works on the Mall.