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There is precedent - 1872 - electors rejected over conern of fraud:

Arkansas
Arkansas voted for the Republican candidate, Ulysses S. Grant, over Liberal Republican candidate Horace Greeley. Grant won Arkansas by a margin of 4.34%. However, due to the turbulent conditions of Reconstruction, along with various irregularities and allegations of electoral fraud, Congress rejected Arkansas's six electoral votes. Neighboring Louisiana's electoral votes were also rejected.

Louisiana
Louisiana voted for the Republican candidate, Ulysses S. Grant, over Liberal Republican candidate Horace Greeley. Grant won Louisiana by a margin of 11.38%. However, due to the turbulent conditions of Reconstruction, along with various irregularities and allegations of electoral fraud, Congress rejected Louisiana's eight electoral votes. Neighboring Arkansas's electoral votes were also rejected.

This is from Wikipedia, so it's less than perfect, I am a presidential election nerd, so I knew about this - but this is an accurate picture as I understand it, of those two states in 1872. Electoral; votes rejected on the basis of a concern of fraud.