; and (B) subject to an oath or attestation under penalty of perjury that the challenger has a good faith factual basis to believe that the individual who is the subject of the challenge is ineligible to register to vote or vote in that election, except a challenge which is based on the race, ethnicity, or national origin of the individual who is the subject of the challenge may not be considered to have a good faith factual basis for purposes of this paragraph. (2) Prohibition on challenges on or near date of election No person, other than a State or local election official, shall be permitted— (A) to challenge an individual’s eligibility to vote in an election for Federal office on the date of the election on grounds that could have been made in advance of such date; or (B) to challenge an individual’s eligibility to register to vote in an election for Federal office or to vote in an election for Federal office less than 10 days before the election unless the individual registered to vote less than 20 days before the election. (b) Buffer rule (1) In general A person who is serving as a poll observer with respect to an election for Federal office may not come within 8 feet of— (A) a voter or ballot at a polling location during any period of voting (including any period of early voting) in such election