Veterans Claim Transparency Act of 2020 This bill requires the Department of Veterans Affairs (VA) to provide the representative of a veteran with an opportunity to review a proposed determination regarding a claim for compensation or benefits before such determination becomes final. The VA must notify the representative in writing that a proposed determination is ready for review and may not make a final determination until the review period has ended. Under the bill, a representative has up to 48 hours to review the proposed determination.